Preparations for running skimage tool on bots.

skimage_main:
Specify the full name of the expectations file to write on the command line,
rather than the folder to write 'results.json'. This is consistent with
writeJsonSummaryPath in GM, as well as the format for reading the file.
Further, it allows more flexibility to name the file.
Do not force opaque when writing bitmaps. skimage does its comparison on
the raw bitmaps. The images are written for visual comparison, and mostly
transparent bitmaps (like resources/plane.png) aren't meaningful when
forced opaque.
Provide an option to to write only mismatches to a directory. Handled
similar to the writePath.
Report a failure if there is no expectations file. This allows writing
to the mismatchPath so we can create an initial baseline.
Pass SkBitmap by const&.

skimage_self_test:
Include the name of the json file in the parameter passed to
createExpectationsPath. The name has been changed to be more specific.

.gitignore:
Ignore the new name of the file created by skimage_self_test.

run.sh:
Run skimage_self_tests.py

BUG=http://code.google.com/p/skia/issues/detail?id=1241
R=epoger@google.com

Review URL: https://codereview.chromium.org/15813016

git-svn-id: http://skia.googlecode.com/svn/trunk@9474 2bbb7eff-a529-9590-31e7-b0007b416f81

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