added libraries associated with TPKLayer.js
added loading.gif
added tpk-layer.html sample
updated readme to include tpk libs
added tpk how-to-use link
updated sample licensing README
use arraybuffer for inMemTiles
remove reader functions
Merge branch 'master' into tpk_layer
rolled in all changes from staging
rolled in all changes from staging
deleted DataStream.js. No longer used.
rolled in updates
fixed relative paths
added basic file upload error handling
renamed button
added andygup.github.io access to proxy
fixed ability to read a url
added sample tpk file (as a zip)
fixed reference to local tpk file. Eliminates cross-origin issues, etc