Merge pull request #35 from netj/parameterized-TRACE_ROOT

Parameterized TRACE_ROOT
Instrumenting MasterCompute class as well
Bug fixes and enhancements for MasterCompute instrumentation

Handling final modifier removal by renaming of @Intercept methods whose
new names are specified by renameTo attribute, e.g.,
`@Intercept(renameTo="getAggregatedValue")` annotation on
`AbstractInterceptingMasterCompute#getAggregatedValueIntercept()`.