Remove UrlGenerator (issue1496041)

[johnfargo]

Reviewers: shindig.remailer_gmail.com,

Description:
This CL bites the bullet and removes all traces of the UrlGenerator
interface from Shindig, instead favoring the replacement *UriManager
classes.
Please review this at http://codereview.appspot.com/1496041/show

Affected files:
  config/container.js
   
java/gadgets/src/main/java/org/apache/shindig/gadgets/DefaultGuiceModule.java
   
java/gadgets/src/main/java/org/apache/shindig/gadgets/DefaultUrlGenerator.java
  java/gadgets/src/main/java/org/apache/shindig/gadgets/UrlGenerator.java
   
java/gadgets/src/main/java/org/apache/shindig/gadgets/UrlValidationStatus.java
   
java/gadgets/src/main/java/org/apache/shindig/gadgets/oauth/GadgetOAuthCallbackGenerator.java
   
java/gadgets/src/main/java/org/apache/shindig/gadgets/render/RenderingGadgetRewriter.java
   
java/gadgets/src/main/java/org/apache/shindig/gadgets/servlet/GadgetRenderingServlet.java
   
java/gadgets/src/main/java/org/apache/shindig/gadgets/servlet/JsServlet.java
   
java/gadgets/src/main/java/org/apache/shindig/gadgets/servlet/JsonRpcHandler.java
   
java/gadgets/src/main/java/org/apache/shindig/gadgets/uri/DefaultJsUriManager.java
   
java/gadgets/src/main/java/org/apache/shindig/gadgets/uri/GlueUrlGenerator.java
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/DefaultGadgetSpecFactoryTest.java
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/DefaultMessageBundleFactoryTest.java
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/DefaultUrlGeneratorTest.java
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/oauth/GadgetOAuthCallbackGeneratorTest.java
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/oauth/GadgetTokenStoreTest.java
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/render/RenderingGadgetRewriterTest.java
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/servlet/GadgetRenderingServletTest.java
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/servlet/HtmlAccelServletTest.java
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/servlet/JsonRpcHandlerTest.java
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/uri/GlueUrlGeneratorTest.java