implemented crude curl for async data read from mapzen vector tile service for geojson tiles. Code cleaning required, and updateTile function should be driven by number of tiles to be read having tileCoordinates calculated based on view.
Add a basic makefile for building the prototype executable for each target platform
Adding Async libcurl code. Also made tileManager govern what tile coordinates to be loaded, which is passed to the dataSource to be fetched from the vectortile service using libcurl multi interface
Merge branch 'dev' of https://github.com/tangram-map/tangram-es into dev
some basic commenting
Add a basic view module for providing a simple orthographic top-down map view
Merge branch 'dev' of https://github.com/tangram-map/tangram-es into dev
Use integer vec3's for tile ids
Modularize platform dependencies: platform-specific headers now available in platform.h
Remove an extra copy of tangram.cpp created by xcode
Add getter for zoom and fix setter for aspect ratio