Start of a debian package for charmstore

PR:
1. Edit buildpackage.sh and change the last line to a PPA to which you can write. 
2. Make sure you have DEBEMAIL set for signing.
3. Install build dependencies (see README.md).
4. Run sh buildpackage.sh.
juju-gui-peeps@lists.launchpad.net ? Maybe https://lists.ubuntu.com/mailman/listinfo/juju-gui-infrastructure would be better to avoid noise to a list that the UX folks follow.