Remove non-OAuth 1.0a functionality (issue1093041)

[lindner]

Reviewers: shindig.remailer_gmail.com, lryan,


Please review this at http://codereview.appspot.com/1093041/show

Affected files:
  M java/common/conf/shindig.properties
  M  
java/gadgets/src/main/java/org/apache/shindig/gadgets/oauth/GadgetOAuthCallbackGenerator.java
  M java/server/src/main/webapp/WEB-INF/authorize.jsp
  M  
java/social-api/src/main/java/org/apache/shindig/social/sample/oauth/SampleOAuthServlet.java