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. Run sh buildpackage.sh
I was planning to make a different deb -- almost exactly like this one in structure -- for charmstore-client binaries. The sources are part of the source package. The binaries are part of the binary package. PPAs only operate on source packages.