Updated the streams tutorials to use UTF8.decoder instead of the deprecated StringDecoder. Reference about StringDecoder change: http://stackoverflow.com/questions/18927667/what-happened-to-stringdecoder-in-dart
Update cmdline tutorial to reflect the breaking changes done in commit r31468 where Platform.environment was changed to return an unmodifiable map. Link to BREAKING CHANGE message in Dart Misc: https://groups.google.com/a/dartlang.org/d/topic/misc/fYe5BgfrVHc/discussion .
Update syntax to use markdown style backticks instead of <code> blocks.
Update syntax to use markdown style backticks instead of <code> blocks.
Changed html escaped < and >.
Merge pull request #288 from Scorpiion/master

Updated the streams and cmdline tutorials