Simplify deploy task by using HEAD.
Simplify deploy task by using HEAD.

Rather than use git branch to find the current
branch, just deploy HEAD.  When a branch is
checked out, this is equivalent.  When HEAD is
detached, we get to deploy a commit that's not at
the tip of a branch.

jqr/heroku_san,fastestforward/heroku_san,gfdgfd/hksan,jqr/heroku_san,gfdgfd/hksan,fastestforward/heroku_san