GitWalkerTest -> GitPopulatorTest
Prefer injection of logger.
ShingleHasher needn't be public.
Simplify ReplacerProvider.
Document tokenizer.
Move Type2Test into right package.
Type2 is language independent, so move into CCModule.
Type2ReplacerFactory should not be public.
Main no longer needed.
Rename PhaseFrontend to Normalizer.
Document CannotBeHashedException.
Hasher not used in other packages -> package private.
Utils not used in other packages.

Should not be instantiated.
Broken! GitWalkerTest and Function2RoughClonerTest

GitWalkerTest is broken atm, needs fix by using the new GitRepo
anyhow, Function2RoughClonerTest is not finished.

In collaboration with Niko Schwarz.
Constructor has to be public for testing.
Remove ZippedGit.java.

It's been superseded by GitRepo protobuf.
FindBugs rightfully demands a null check.
Replacement for MapperRunner designed.

The Pipeline.
Exchange MapperRunner for Pipeline.

All tests green.
CellSource is now utterable itself.

Removing partitions() method.