SHINDIG-1144 use correct json-rpc protocol response (issue1360041)

[li...@inuus.com]

Reviewers: shindig.remailer_gmail.com,

Message:
would appreciate it if people could have a look at this..  It's a
significant change...


Description:
This CL corrects the protocol response for json-rpc requests.

It also adds a backwards compatible mode that returns json with both
'data' and 'result' keys.


Please review this at http://codereview.appspot.com/1360041/show

Affected files:
   M  
features/src/main/javascript/features/opensocial-jsonrpc/jsonrpccontainer.js
   M features/src/main/javascript/features/osapi/jsonrpctransport.js
   M java/common/conf/shindig.properties
   M  
java/common/src/main/java/org/apache/shindig/protocol/JsonRpcServlet.java
   M  
java/common/src/test/java/org/apache/shindig/protocol/JsonRpcServletTest.java
   M  
java/gadgets/src/main/java/org/apache/shindig/gadgets/preload/PipelineExecutor.java
   M  
java/gadgets/src/main/java/org/apache/shindig/gadgets/preload/PipelinedDataPreloader.java
   M  
java/gadgets/src/main/java/org/apache/shindig/gadgets/render/DefaultServiceFetcher.java
   M  
java/gadgets/src/main/java/org/apache/shindig/gadgets/servlet/HttpRequestHandler.java
   M  
java/gadgets/src/test/java/org/apache/shindig/gadgets/preload/PipelineExecutorTest.java
   M  
java/gadgets/src/test/java/org/apache/shindig/gadgets/preload/PipelinedDataPreloaderTest.java
   M  
java/gadgets/src/test/java/org/apache/shindig/gadgets/render/DefaultServiceFetcherTest.java
   M  
java/gadgets/src/test/java/org/apache/shindig/gadgets/rewrite/PipelineDataGadgetRewriterTest.java
   M  
java/server/src/test/java/org/apache/shindig/server/endtoend/EndToEndTest.java