Disable Brakeman pre-commit hook by default
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 <d95b56ce41a2e1ac4cecdd398defd7414407cc08@causes.com>
Reviewed-by: Shane da Silva <6f6e68d1df92f30cb4b3ce35260ddf94a402f33d@causes.com>

oxocode/overcommit,TheSooth/overcommit,gnagel/overcommit,oxocode/overcommit,blech75/overcommit,gnagel/overcommit,TheSooth/overcommit,blech75/overcommit