Automatically discover homebrew lib/ and include/ paths if installed on OSX.

This change allows Pillow to discover installed libs on OSX when using the homebrew package manager outside of `/usr/local/`.

It relies on the commands module, which goes away in Python 3.  If it seems like a good change to add, I can switch the code over to subprocess.
testcase for multiline text spacing
actually cleaning
Merge pull request #333 from wiredfool/paddywwoof-truetype

Vertical Alignment of ttf rendering
fix FASTOCTREE quantizer for large images (>16MP)

the color value counter sums all color values and this overflows
a uint32 at 16M white pixels, 32M gray pixels, etc.
Merge pull request #334 from olt/octree-large-img-fix

fix FASTOCTREE quantizer for large images (>16MP)
Merge pull request #330 from donspaulding/patch-1

Automatically discover homebrew include/ and lib/ paths on OSX
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Add provides PIL

Testing http://www.python.org/dev/peps/pep-0426/#provides
issue328: _imagingcms.c: include windef.h to fix build issue on MSVC
issue 329: setup.py: better support for C_INCLUDE_PATH, LD_RUN_PATH, etc.
Fix to support colon separated path list, and also support INCLUDE and LIB
environment variable used by MSVC.
Rename
Merge pull request #335 from nu774/issue328

issue328: _imagingcms.c: include windef.h to fix build issue on MSVC
Add history
Merge pull request #336 from nu774/issue329

issue 329: setup.py: better support for C_INCLUDE_PATH, LD_RUN_PATH, etc...
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Wording [ci skip]
Wording [ci skip]
Properly set the mode for files with rawmode of F;32BF
added tagnames for ImageJ tiff tags