Rename InMemory to InMemoryStorage.
Fix GitPopulatorTest.

Except for one test which stupidly fails :(

Need to investigate.
All tests green again.
Delete unused file.
Move Unused CC files to mappers.
Moving the rest of active record to mappers.
Simplifying GitPathInputFormat.java.
Allow CellSource.write to throw IOException.
Added a smoke test for HBaseCellSink.

Andrei
Simplified the HBaseTest.

Andrei
Simplify GitInputFormat.
Formatting.
Formatting.
Cleaning up HBaseCellSinkTest.
Inline HTableWriteBuffer into HBaseCellSink.
Further simplify GitPathInputFormat.
Bugfix: HBaseCellSink now closes HTable.
Formatting.
Document hadoop annotations.
Allow LookupTable to throw IOException.