- Adding master.compute()'s instrumentation. Adds AbstractInterceptingMasterCompute.java, BottomInterceptingMasterCompute.java, and UserMasterCompute.java, mimicking Jaeho's previous commit.
- Extracts what's commong between AbstractInterceptingComputation.java and AbstractInterceptingMasterCompute.java into CommonVertexMasterInterceptionUtil.java.
- Reorder's the protocol buffers IDs.