Remove trailing whitespace
Update to Traceur 0.0.72

Lots of tests broken currently. Subsequent commits fix.
Update errors tests for new Traceur
Updating features for new Traceur

Block scoping is now enabled by default. Comprehensions are now disabled by default. Using async functions as the example of things to turn on.
Disable block scope tests until Traceur fixes itself

See https://github.com/google/traceur-compiler/issues/1358.
Update info on source maps
Fix Travis to test Node 0.10, not Node 0.1