sdk update: Uri move to dart:core
Merge git://github.com/johnmccutchan/asset_pack into dev_fixes
sdk update
fix some computation of the progressControler (avoid NaN in some case)
Merge github.com:johnmccutchan/asset_pack into dev_fixes
fix unit test broken by refactor
set AssetPackTrace._streamCtrl synchronous (to fix test case
 and receive all events (else no XxxEnd event after XxxError event)
Merge pull request #27 from davidB/dev_fixes

Some fixes