Do unicode migration for rbtools/helpers/
Review Request #6695 — Created Dec. 15, 2014 and submitted
This change updates the code in the rbtools/helpers/ directory to have a
correct separation of unicode vs bytes, and use unicode literals everywhere.
Ran unit tests.
Tool: Pyflakes Processed Files: rbtools/helpers/hgext.py Tool: PEP8 Style Checker Processed Files: rbtools/helpers/hgext.py