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Declare 3.4 support
Prefer homebrew freetype over X11 freetype (but still allow both)

I've recently included Pillow with a py2app build of a frozen application on OS X. When Pillow is installed on a machine that has X11, the preference for X11's libfreetype causes a new dependency for my frozen app. I don't want my users to be required to install X11 if they don't have to (it's not included by default after OS X 10.8).

This PR adds a preference for homebrew's libfreetype (if available), which py2app detects and includes, and which doesn't create an X11 dependency in apps that are frozen and use Pillow (PIL).
Merge pull request #466 from dmckeone/patch-2

Prefer homebrew freetype over X11 freetype (but still allow both)
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Correctly quote file names for WindowsViewer command
Merge pull request #467 from cgohlke/patch-1

Correctly quote file names for WindowsViewer command
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Use assert_image_similar instead of assert_image_equal in test_file_webp.py
Merge pull request #469 from manisandro/test_webp

Use assert_image_similar in test_file_webp.py