Fix issue with ParseTreeWriter generating invalid code

Fix issue with ParseTreeWriter generating invalid code for `1 .member`

Review URL: https://github.com/google/traceur-compiler/pull/864

Closes #864.
CPS transformer: Support yield in do while condition

Review URL: https://github.com/google/traceur-compiler/pull/876

Closes #876.
Merge branch 'master' into cps-yield-in-for-loop
Use replaceStartState and replaceFallThroughState