Simplify funciton dispatch in CLI
s/warnings/messages/
First elem of a msg array denotes the origin of the msg
Add stats for hook levels
Move levels definitions into a separate file
Add CLI args to control checks
Tests
Mention that -c can be used more then once
placeables are errors, spelling suggestions are warnings
Merge pull request #2 from stasm/hook-levels

Add severity levels to hooks: INFO, WARNING, ERROR.
Move to test l10n dir against the whole Gaia source repo