Release v0.17.0

Changes:

- Update to libgit2 v0.17.0
- New method 'Repository.create_blob'

Thanks to Nico von Geyso.

Release v0.16.2

Highlights:

- Fix serious memory bug
- Change signature of 'TreeBuilder.insert'
- Improve support of Windows

Thanks to Benjamin Kircher, Han-Wen Nienhuys and Yonggang Luo.

Release v0.16.1

Highlights:

- Tag.target now returns the OID, not the object
- New method "Repository.status_file(path)"
- New function "discover_repository(...)"
- Supporting tree-builders
- Improving pygit2 on Windows
- Various bugs fixed, including a couple of segfaults

Thanks to Amit Bakshi, Bryan O'Sullivan, Carlos Martín Nieto,
Han-Wen Nienhuys and Yonggang Luo.

Release v0.16.0

Changes since v0.15.1:

- Update to libgit2 v0.16.0
- Improve support for references
- New method Index.read_tree
- Rename Index.create_tree to Index.write_tree
- Fix compilation error with MSVC (issue libgit2#53)
- Fix a few segfaults (including issue libgit2#55)

Return bytes for paths (and encodings) on Python 2

Update setup file

Following PEP7 recommendations on function definition style.

Fix compilation warnings, remove unused variables

Optimize index iterator, refactor code