Add Brakeman pre-commit hook

Change-Id: I2ac702d8f6822c7a4af56f3a2519ee6ef2e7f158
Reviewed-on: http://gerrit.causes.com/37960
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>
Clean up Brakeman pre-commit hook

Change-Id: If8ca86338b4d85a0d761ade716c8697ad69178b8
Reviewed-on: http://gerrit.causes.com/37961
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>
Disable Brakeman pre-commit hook by default

This hook is slow and therefore of questionable value. Allow people to
opt-in to it rather than by default.

Change-Id: Iad8ef549e39d46afd2acb605a77152ca134a1f77
Reviewed-on: http://gerrit.causes.com/37962
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>