Add a web font to use in specs, "Open Sans".
Merge pull request #844 from AnalyticalGraphicsInc/updateRequireJS

Upgrade RequireJS to version 2.1.6, and Almond to 0.2.5.
Fix a test that was flawed in several ways.
Change font used by test
Fix the way visibility is reset to default.
Improve specs to pass more reliably based on font differences.
Merge pull request #845 from AnalyticalGraphicsInc/consistentFonts

Fix problems with font-based specs
Adjust test to round colors between 0 and 255 to 255 to account for systems that use subpixel anti-aliasing for text on canvas.
Merge pull request #846 from AnalyticalGraphicsInc/fixWriteTextToCanvasSpec

Adjust test to round colors between 0 and 255 to 255 to account for systems that use subpixel anti-aliasing for text on canvas.
Merge branch 'master' into viewer