Merge pull request #12 from tbq/master

Mocking
- Changing the scenario to include superstepNo and changing vertexValue to vertexValueBefore and	vertexValueAfter.
- Fixing TestCaseScnearioWriter	   and GiraphScenarioWrapper according to the .proto change.
- Adding initial AbstractInterceptingComputation class and DebugConfig and an example SimpleShortestPathsDebugComputation. (currently does not save anything as a .proto though some code is initiated to do so.)
- Adds saveToHDFS method to GiraphScenearioSaverLoader.java
- Makes AbstractInterceptingComputation write traces (in scenario.proto format with .tr file suffix) to HDFS. Currently writes under /giraph-debug-traces/dummy_job/.
- Fixes a bug in GiraphScenarioWrapper, where the passed in neighborId, message, and vertex value before and after were not being saved as separate objects. Adding a makeClone method to make clones of those.
- Removing some printlns from other files.
- Renaming GiraphTestScenarioWriter to GiraphDebugTraceReader. Using that class simply to test that the traced proto files look ok. Checking it in to mainly help Vikesh.
Fixing a leftover TODO from SimpleShortestPathsDebugComputation.java.
Fetching actual data from HDFS in the backend
Fixing minor style issues with last commit
Incorporating PR comments
Incorporating PR comments#2
Incorporating PR comments#3
Merge pull request #13 from vikeshkhanna/master

Fetching actual data from HDFS in the backend
Plugin Wizard UI