first step
dynamic polyline
Add some helper functions for the UVs
fixing uv on polygons
Merge branch 'master' into multiStyles

Conflicts:
	core/src/style/style.cpp
Misc Changes (Described further)

1. Added debug flags to ios cmake
2. pan velocity takes zoom level into account now, fixes the inconsistent pan speed when at different zoom levels.
3. added some checks in View::setZoom to better handle valid tile IDs
Merge branch 'master' of https://github.com/tangram-map/tangram-es
changeing uvs name for texcoord as webgl
Merge branch 'master' of github.com:tangrams/tangram-es into uvs
Fix warnings
fixes
merge
fix merge
Refactor GeometryHandler to reduce code duplication
Merge branch 'uvs' of https://github.com/tangram-map/tangram-es into uvs
Refactor geometryHandler

-The polyline tesselation algorithm was duplicated in several functions, now all polyline building functions call a single generalized building function
-Renamed buildDynamicPolyline and related variables to buildScalablePolyline, to better reflect usage
Rename 'GeometryHandler' to 'Builders'
Remove unused include
Undo using UVs as color; use UVs for road outline
Documentation for Builders