cros_workon_make: support '.' for the project name
cros_workon_make: support '.' for the project name

Handy extension which allows you to run cros_workon_make in any
directory and have it do the right thing.

The lame part is that you have to setup the mapping from git
project to ebuild yourself. I could do it dynamically but it would be
super slow.

BUG=none
TEST=Tested with and without workon.pkg set.

Change-Id: I7ba178032231ed93b89dca0755f1db414f83fa85
Reviewed-on: http://gerrit.chromium.org/gerrit/1970
Reviewed-by: Chris Masone <98e3d65c6b0e9e2391eb4c2e8b1e572b77e544ed@chromium.org>
Tested-by: Mandeep Singh Baines <19acf4ef1f391f4aab404dc5703cac3632e06f3a@chromium.org>

coreos/dev-util,marineam/coreos-dev-util,mgireesh05/dev-util,mgireesh05/dev-util,coreos/dev-util,marineam/coreos-dev-util,coreos/dev-util,mgireesh05/dev-util