Commits on Oct 24, 2016

1. Fixes to support Python 2.6 again. …

   Details:
   
   - Added Python 2.6 again to .travis.yml (it was removed in commit 4486bcb).
   
   - Replaced the use of dictionary comprehensions in `git/cmd.py` around
     line 800 with the code before that change (in commit 25a2ebf).
     Reason: dict comprehensions were introduced only in Python 2.7.
   
   - Changed the import source for `SkipTest` and `skipIf` from `unittest.case`
     to first trying `unittest` and upon ImportError from `unittest2`.
     This was done in `git/util.py` and in several testcases.
     Reason: `SkipTest` and `skipIf` were introduced to unittest only
     in Python 2.7, and `unittest2` is a backport of `unittest` additions
     to Python 2.6.
   
   - In git/test/lib/helper.py, fixed the definition of `assertRaisesRegex`
     to work on py26.
   
   - For Python 2.6, added the `unittest2` dependency to `requirements.txt`
     and changed `.travis.yml` to install `unittest2`. Because git/util.py
     uses SkipTest from unittest/unittest2, the dependency could not be added
     to `test-requirements.txt`.
   
   - Fixed an assertion in `git/test/test_index.py` to also allow
     a Python 2.6 specific exception message.
   
   - In `is_cygwin_git()` in `git/util.py`, replaced `check_output()` with
     `Popen()`. It was added in Python 2.7.
   
   - Enabled Python 2.6 for Windows:
   
     - Added Python 2.6 for MINGW in .appveyor.yml.
   
     - When defining `PROC_CREATIONFLAGS` in `git/cmd.py`, made use of certain
       win32 and subprocess flags that were introduced in Python 2.7, dependent
       on whether we run on Python 2.7 or higher.
   
     - In `AutoInterrupt.__del__()` in `git/cmd.py`, allowed for `os` not having
       `kill()`. `os.kill()` was added for Windows in Python 2.7 (For Linux, it
       existed in Python 2.6 already).

   

   andy-maier committed Oct 24, 2016

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