Merge pull request #131 from Samsung/Issue_130

Issue 130
tests:  Rename text test to test-glyphs

This is to make way for the more basic text test from FlashCanvas.
tests:  Add text test replicating FlashCanvas functionality
README: Explain how to see our available cmake variables
Enable text and transform tests
Add 10 color stops for skia linear and radial gradient tests.
Issue #130. Add cairo text case similar to skia & Minor corrections to skia text case.