Use namedtuple for index entry.
Add porcelain for 'status'.
Add test to make sure unmodified files don't show up in get_unstaged_changes.
Move logic for creating blog from path to dulwich.index.
Use the print() function in Makefile.

Use the print() function rather than the print statement in the
Makefile.
print(): Switch from statement to funtion.
Fix octal literals.
Use io module instead of file.
Use int division `//` insted of float division `/`.
Make next methods available as __next__.
Use assertEqual rather than assertEquals as the latter is deprecated.
Fix unclosed file ResourceWarnings.
Correctly handle binascii.Error.
Use for loop instead of map when not iterating.
Check for bytes rather than str.
Use bytes literals instead of string literals.
Use 2to3 in setup.py.
Change itertools import style so that it is corrected by 2to3
Hack to prevent 2to3 from changing this.