Added plumbing code for 2.0

src/main/java/org/scribe/builder/api/DefaultApi20.java

@@ -0,0 +1,14 @@
+package org.scribe.builder.api;
+
+import org.scribe.oauth.OAuthService;
+
+public class DefaultApi20 implements Api
+{
+
+  @Override
+  public OAuthService createService(String apiKey, String apiSecret, String callback, String scope)
+  {
+    return null;
+  }
+
+}

src/main/java/org/scribe/oauth/OAuth2ServiceImpl.java

@@ -0,0 +1,40 @@
+package org.scribe.oauth;
+
+import org.scribe.model.OAuthRequest;
+import org.scribe.model.Token;
+import org.scribe.model.Verifier;
+
+public class OAuth2ServiceImpl implements OAuthService
+{
+
+  @Override
+  public void addScope(String scope)
+  {
+    throw new UnsupportedOperationException("OAuth 2 does not use scopes");
+  }
+
+  @Override
+  public Token getAccessToken(Token requestToken, Verifier verifier)
+  {
+    return null;
+  }
+
+  @Override
+  public Token getRequestToken()
+  {
+    throw new UnsupportedOperationException("OAuth 2 does not use request tokens. Use 'getAccessToken' directly");
+  }
+
+  @Override
+  public String getVersion()
+  {
+    return "2.0";
+  }
+
+  @Override
+  public void signRequest(Token accessToken, OAuthRequest request)
+  {
+    
+  }
+
+}