Added bunch of javadocs and restricted some visibility.

No functional changes

src/main/java/org/scribe/model/OAuthConfig.java

@@ -1,5 +1,10 @@
 package org.scribe.model;
 
+/**
+ * Parameter object that groups OAuth config values
+ * 
+ * @author Pablo Fernandez
+ */
 public class OAuthConfig
 {
   private String apiKey;

src/main/java/org/scribe/model/OAuthConstants.java

@@ -19,7 +19,6 @@ package org.scribe.model;
  * This class contains OAuth constants, used project-wide
  * 
  * @author Pablo Fernandez
- * 
  */
 public class OAuthConstants
 {

src/main/java/org/scribe/model/Request.java

@@ -14,7 +14,6 @@ import org.scribe.utils.*;
  */
 class Request
 {
-
   private static final String CONTENT_LENGTH = "Content-Length";
 
   private String url;

src/main/java/org/scribe/model/Response.java

@@ -13,7 +13,6 @@ import org.scribe.utils.*;
  */
 public class Response
 {
-
   private static final String EMPTY = "";
 
   private int code;
@@ -52,11 +51,6 @@ public class Response
     return headers;
   }
 
-  /**
-   * Checks if the code is in the successful or redirect range.
-   * 
-   * @return true if successful
-   */
   private boolean wasSuccessful()
   {
     return getCode() >= 200 && getCode() < 400;

src/main/java/org/scribe/model/Token.java

@@ -1,11 +1,21 @@
 package org.scribe.model;
 
+/**
+ * Represents an OAuth token (either request or access token) and its secret
+ * 
+ * @author Pablo Fernandez
+ */
 public class Token
 {
-
   private final String token;
   private final String secret;
 
+  /**
+   * Default constructor
+   * 
+   * @param token token value
+   * @param secret token secret
+   */
   public Token(String token, String secret)
   {
     this.token = token;

src/main/java/org/scribe/model/Verifier.java

@@ -1,10 +1,19 @@
 package org.scribe.model;
 
+/**
+ * Represents an OAuth verifier code.
+ * 
+ * @author Pablo Fernandez
+ */
 public class Verifier
 {
-
   private final String value;
 
+  /**
+   * Default constructor.
+   * 
+   * @param value verifier value
+   */
   public Verifier(String value)
   {
     this.value = value;