Start of a debian package for charmstore
address review concerns

document build dependencies
describe DEBEMAIL
use TARGETPPA envvar
git pull if charmstore dir is already present
use debsign to sign pacakges. dpkg-buildpackage did not prompt for password.
include essync in package
write config.yaml to a /etc/charmstore, not /etc
add missing files; more docs
address review concerns

typos
docs
no v prefix on tags
use ~yellow/ppa and ~yellow/experimental
Merge pull request #1 from jrwren/master

Start of a debian package for charmstore