Add gitignore.
Fix hang in hooks/install
* Added -y to add-apt-repository so it runs without human intervention.
Merge pull request #9 from jaycee/master

Fixes a hooks/install hang
Merge branch 'master' into add-mysql
Added database-relation-changed.
Fixed hook stub.
We don't need sys.
Add functionality.
* Call back ready for db relations.
* Merges in db values with config.
* Writes out.