Update iOS precompiled libtess2 to include architectures for iOS devices
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
Merge branch 'master' of github.com:tangrams/tangram-es into lights
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
Add newlines
Code style changes, cleaning, and documentation for geom.h and geom.cpp
Remove unused (large) geometry functions