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.
let's make sure this is a fork of the ~yellow so that it's kept private. Maybe make up a testing or dummy ppa target for docs that are safe in a copy/paste situation.