Merge branch 'index' into improvements

* index:
  Removed index test marker for custom commits as this boils down to a good way to add files to the index/remove them and make commits which are possibly customized with custom parents
  index writing now creates a sha on the content making it possible to write valid indices after manually removing or altering entriesgst
  Implemented merge/resolve handling , but realized that index writing is not yet working properly as it is sha1 checked as well. This explains what my 20 byte 'extension_data' actually is ;)
  index: Added write_tree method including test
  index.iter_blobs method added including tests ( which have been improved generally for more coverage )
  tree.traverse: Added prune functionality - previously the predciate did both, pruning and preventing to return items
  Improved testing of index against trees, tests succeed with next commit
  Initial version of merge including tests for one-way, two-way and tree-way merge
  index writing added including simple test, improved docs of IndexEntry
  improved IndexEntry type and added test for parsing of the stage
  Improved tuple access of EntryIndex class including test, stage and type access still needs to be decoded though
  Added initial version of the index reading from file - IndexEntry interface is to be improved though, writing needs to be implemented as well
  Added frame for index implementation and testing

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