- Huge refactorization in scenario.proto. Moves common information between master's context and vertex's context into a CommonVertexMasterContext. Adds a VertexScenarioClasses message to capture all the classes for each vertex.
- Refactorization in the Wrapper classes. They all now extend BaseWrapper and have consistent names.
- Fixes a bug in the sandwich instrumentations where the ImmutableGiraphClassesConfig was using the wrong class name for user's class.