fixing compatibility issues with the Dart M2 release
incrementing minor version
fix documentation, reference to M1 release not needed anymore
minor details in documentation

Added possibility to reference dartlr from pub.dartlang.org
updating to version 0.2.0

Following versioning pattern in Dart project, updating to 0.2.0
after M2 release
Merge pull request #15 from Gubaer/fix-M2-issues

Fix m2 issues
- M3 upgrades...
- Some improvements on .stg templates