Added authorization URL to the Apis

src/main/java/org/scribe/builder/api/DefaultApi10a.java

@@ -117,6 +117,15 @@ public abstract class DefaultApi10a implements Api
    */
   public abstract String getAccessTokenEndpoint();
   
+  /**
+   * Returns the URL where you should redirect your users to authenticate
+   * your application.
+   * 
+   * @param requestToken the request token you need to authorize
+   * @return the URL where you should redirect your users
+   */
+  public abstract String getAuthorizationUrl(Token requestToken);
+  
   /**
    * Returns the {@link OAuthService} for this Api
    * 

src/main/java/org/scribe/builder/api/EvernoteApi.java

@@ -1,9 +1,12 @@
 package org.scribe.builder.api;
 
+import org.scribe.model.Token;
 import org.scribe.model.Verb;
 
 public class EvernoteApi extends DefaultApi10a
 {
+  private static final String AUTHORIZATION_URL = "https://www.evernote.com/OAuth.action?oauth_token=%s";
+  
   @Override
   public Verb getRequestTokenVerb()
   {
@@ -27,4 +30,10 @@ public class EvernoteApi extends DefaultApi10a
 	{
 		return "https://www.evernote.com/oauth";
 	}
+	
+	@Override
+	public String getAuthorizationUrl(Token requestToken)
+	{
+	  return String.format(AUTHORIZATION_URL, requestToken.getToken());
+	}
 }

src/main/java/org/scribe/builder/api/FoursquareApi.java

@@ -1,7 +1,11 @@
 package org.scribe.builder.api;
 
+import org.scribe.model.Token;
+
 public class FoursquareApi extends DefaultApi10a
 {
+  private static final String AUTHORIZATION_URL = "http://foursquare.com/oauth/authorize?oauth_token=%s";
+  
   @Override
   public String getAccessTokenEndpoint()
   {
@@ -13,4 +17,10 @@ public class FoursquareApi extends DefaultApi10a
   {
     return "http://foursquare.com/oauth/request_token";
   }
+  
+  @Override
+  public String getAuthorizationUrl(Token requestToken)
+  {
+    return String.format(AUTHORIZATION_URL, requestToken.getToken());
+  }
 }

src/main/java/org/scribe/builder/api/GoogleApi.java

@@ -4,6 +4,8 @@ import org.scribe.model.*;
 
 public class GoogleApi extends DefaultApi10a
 {
+  private static final String AUTHORIZATION_URL = "https://www.google.com/accounts/OAuthAuthorizeToken?oauth_token=%s";
+  
   @Override
   public String getAccessTokenEndpoint()
   {
@@ -27,4 +29,10 @@ public class GoogleApi extends DefaultApi10a
   {
     return Verb.GET;
   }
+  
+  @Override
+  public String getAuthorizationUrl(Token requestToken)
+  {
+    return String.format(AUTHORIZATION_URL, requestToken.getToken());
+  }
 }

src/main/java/org/scribe/builder/api/LinkedInApi.java

@@ -2,6 +2,8 @@ package org.scribe.builder.api;
 
 public class LinkedInApi extends DefaultApi10a
 {
+  private static final String AUTHORIZE_URL = "https://api.linkedin.com/uas/oauth/authorize?oauth_token=%s";
+
   @Override
   protected String getAccessTokenEndpoint()
   {
@@ -13,4 +15,11 @@ public class LinkedInApi extends DefaultApi10a
   {
     return "https://api.linkedin.com/uas/oauth/requestToken";
   }
+  
+  @Override
+  public String getAuthorizationUrl(Token requestToken)
+  {
+    return String.format(AUTHORIZE_URL, requestToken.getToken());
+  }
+  
 }

src/main/java/org/scribe/builder/api/TwitterApi.java

@@ -1,7 +1,11 @@
 package org.scribe.builder.api;
 
+import org.scribe.model.Token;
+
 public class TwitterApi extends DefaultApi10a
 {
+  private static final String AUTHORIZE_URL = "https://api.twitter.com/oauth/authorize?oauth_token=%s";
+  
   @Override
   public String getAccessTokenEndpoint()
   {
@@ -13,4 +17,10 @@ public class TwitterApi extends DefaultApi10a
   {
     return "http://api.twitter.com/oauth/request_token";
   }
+  
+  @Override
+  public String getAuthorizationUrl(Token requestToken)
+  {
+    return String.format(AUTHORIZE_URL, requestToken.getToken());
+  }
 }

src/main/java/org/scribe/builder/api/VimeoApi.java

@@ -1,7 +1,11 @@
 package org.scribe.builder.api;
 
+import org.scribe.model.Token;
+
 public class VimeoApi extends DefaultApi10a
 {
+  private static final String AUTHORIZATION_URL = "http://vimeo.com/oauth/authorize?oauth_token=%s";
+  
   @Override
   public String getAccessTokenEndpoint()
   {
@@ -13,4 +17,10 @@ public class VimeoApi extends DefaultApi10a
   {
     return "http://vimeo.com/oauth/request_token";
   }
+  
+  @Override
+  public String getAuthorizationUrl(Token requestToken)
+  {
+    return String.format(AUTHORIZATION_URL, requestToken.getToken());
+  }
 }

src/main/java/org/scribe/builder/api/YahooApi.java

@@ -1,7 +1,11 @@
 package org.scribe.builder.api;
 
+import org.scribe.model.Token;
+
 public class YahooApi extends DefaultApi10a
 {
+  private static final String AUTHORIZE_URL = "https://api.login.yahoo.com/oauth/v2/request_auth?oauth_token=%s";
+  
   @Override
   public String getAccessTokenEndpoint()
   {
@@ -13,4 +17,10 @@ public class YahooApi extends DefaultApi10a
   {
     return "https://api.login.yahoo.com/oauth/v2/get_request_token";
   }
+  
+  @Override
+  public String getAuthorizationUrl(Token requestToken)
+  {
+    return String.format(AUTHORIZE_URL, requestToken.getToken());
+  }
 }

src/main/java/org/scribe/builder/api/YammerApi.java

@@ -1,7 +1,10 @@
 package org.scribe.builder.api;
 
+import org.scribe.model.Token;
+
 public class YammerApi extends DefaultApi10a
 {
+  private static final String AUTHORIZATION_URL = "'https://www.yammer.com/oauth/authorize?oauth_token=%s'";
 
 	@Override
 	public String getRequestTokenEndpoint()
@@ -14,5 +17,10 @@ public class YammerApi extends DefaultApi10a
   {
 		return "https://www.yammer.com/oauth/access_token";
 	}
-
+	
+	@Override
+	public String getAuthorizationUrl(Token requestToken)
+	{
+	  return String.format(AUTHORIZATION_URL, requestToken.getToken());
+	}
 }