Adds the ability to control access to viewing release branches from the UI.
Modifies queries to be more in the spirit of the original clobberer, that is, no longer show branches which contain builddirs of the form rel-*
Revert "Bumps version to 0.3.0"

This reverts commit 9c2e23756bbbae55582f73fefdb07385990bc2c2.
Remove permissions regarding allowing users to see release branches. Instead block all release branches from being seen by anyone.
Makes it impossible to clobber release build directories

It shouldn't be possible to force clobbers of rel-* builddirs even via the api; r=bhearsum
Removes un-necessary permission
Fixes clobberer version.
Adds a more accurate debug message for rejecting clobbers.
Merge pull request #10 from mrrrgn/release-security

Release security: make it impossible to clobber builddirs which have the "release prefix"