Merge pull request #5 from disko/master

Upgrade to Bootstrap 2.2.2. Thanks disko.
Preparing release 2.2.2
Back to development: 2.2.3
Update README.rst
Update README.rst
upgrades to bootstrap 2.3.0
Preparing release 2.3.0
Back to development: 2.3.1
Upgrade to bootstrap 2.3.1