initial work to switch to a unified build file loaded for both main thread & worker threads
move base URL finder to Utils
lint & debug
fix tests, make URL to load worker from an option
add lib back to karma conf
Merge branch 'master' into unified-build
replace glslify with the tangram transform system
remove some unused shader code (some lighting code remains, may remove)
fix mode-specific properties in stylesheet
add Scene.rebuild() as alias for rebuildGeometry()
added color uniform to lights
changed light uniforms to 3fv
lint
Merge pull request #71 from tangrams/lightcolor

added color uniform to lights
renaming render 'mode' to 'style' (WIP)
rename Style to StyleParser (WIP)
moving style file
fix tests
Merge branch 'master' into remove-glslify
Merge pull request #70 from tangrams/remove-glslify

Replace glslify with the tangram shader transform system
Merge branch 'master' into unified-build