Merge pull request #7 from yjbanov/master

Test-friendy time providers and utilities
bump version, add time.dart to README
Fix CountdownTimer
Add mirrors.dart
Added Multimap, ListMultimap, SetMultimap
Merge pull request #9 from cbracken/collections

Add Multimap, ListMultimap, SetMultimap
Bump version
bump for SDK v0.6.21+3
Merge pull request #12 from kevmoo/master

bump for SDK v0.6.21+3
Update version to 0.8.1
Added optional encoding parameter, unit tests for byteStreamToString()
Merge pull request #13 from cbracken/bytestream-encoder

Add optional encoding parameter to byteStreamToString()
Formatting. No change to test logic.
String utilitities
Merge remote-tracking branch 'upstream/master'