adds workaround for Typeface class bug
adds activeLayers
deprecates addLayer as it was before
reinforces tilejson id check
adds pre-looper checks for current map layer in TileLoader
changes setTileSource to initialize provider instead of adding more queues (doesn't work)
substitutes downloaderProvider instead of adding a new one
uses MapView's getTileprovider in getLayer to reuse provider, resetting tiles
origin is no longer needed
Merge pull request #38 from mapbox/downloader-interrupt

Downloader interrupt
adds jar build
Merge branch 'master' of https://github.com/mapbox/mapbox-android-sdk
adds checks for high density screens
adds 2x to tile request when density check returns true
adds jar build
adds check to make sure the 2x map is a mapbox map, otherwise loads tiles as usual
removes unnecessary permissions
changes map tile directory nomenclature to id/url
adds support for Mapbox id declaration in XML layout
adds LICENSE