convert image_reader public interface to use CamelCase to match the rest of codebase
add {prefix} to tile URL replacement token scheme

prefix is a 2 character hex code derived from the tile x/y
Merge pull request #651 from mapbox/prefix

Add {prefix} to tile URL replacement token scheme
add jpeg_static_libs to linux install ldflags
Merge branch 'master' of github.com:mapbox/mapbox-gl-native
Eliminate Map::getGlyphAtlas()
Eliminate Map::getSpriteAtlas()
Eliminate Map::getGlyphStore()
Map Map::getWorker() private
Eliminate Map::getTexturepool()
Make Map::getSprite() private
Eliminate Map::getStyle()
Eliminate remaining uses of Map in TileData
Pass SourceInfo as reference
Store SourceInfo as direct member
auto
Remove redundant access specifiers