Release Name: 1.3.0

Notes:
Interim release before we start work on supporting multiple version control options.

New features:

* build serialization
* automatic purging of old builds
* experimental CC.rb plugin infrastructure

IMPORTANT:

CC.rb data is now stored in $HOME/.cruise/ directory by default


Changes:
- cruise data (build results, etc) is stored in $HOME/.cruise/ by default
- builds can now be serialized - with a config option set, CC.rb will only run one build at a time
- option to auto delete more than N builds
- [experimental] plugins can be installed w/ script/cruise_plugin script
- [bugfix] build requested status now stays on dashboard until a build starts
- [patch] subversion external support - Nathan Wilmes
- [patch] relative url support - Neal Clark