Grep: make it more of a passthrough to git grep
Grep: make it more of a passthrough to git grep

* Can now pass args to git grep:
  bosco grep -- -A3 foo
  bosco grep GET test  #This one needs some work, spews some errors
* Continue on errors.
  * We should figure out a way to only ignore repo-specific errors.

tomgco/bosco,tomgco/bosco,ahmadassaf/Bosco,tes/bosco,ahmadassaf/Bosco,tes/bosco,tomgco/bosco