Attempt 1 at adding grep option to console runner
Remove Brunch t --filter option

Revert by hand of
https://github.com/brunch/brunch/commit/d87cd0c8ce8bbf5143dd74c52a7e40b8
ec610b50
Merge pull request #460 from jkresner/master

Expose Mocha's Grep option to intelligently select tests to run in console