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you can pass quick=true to to disable style guideline
checks and only check for syntax errors.

this will also spit out javascript style warnings using
jshint and gjslint.  I have not nailed down exactly
which things we want to warn about, we can talk about
it and come to a consensus on what we care about. 
I do not necessarily think that we should
use both jshint and gjslint, I just put them both
in to show what kind of things they can check for.
in order to use gjslint, you need to install
it from http://code.google.com/closure/utilities/

Make your .git/hooks/pre-commit look like:
rake canvas:check_syntax:changed quick=true
to not allow committing js with syntax errors

Change-Id: Icfc21c2d30f60dc2fafef80d5c93432b6309afdb
Reviewed-on: https://gerrit.instructure.com/2908

Tested-by: Hudson <hudson@instructure.com>
Reviewed-by: Zach Wily <zach@instructure.com>