Add infrastructure for glsl-unit
Use glsl-unit in WebGL map renderer
Use glsl-unit in WebGL tile layer renderer
Configure Travis to build shaders with glsl-unit
Move shader support code into ol.webgl
Tidy up ol.webgl namespace
Make time-sensitive test less sensitive
Add comment about automatically generated files
Merge pull request #425 from twpayne/glsl-unit

Use glsl-unit for WebGL shaders