Merge pull request #4 from mmoss/bump_bootbox_version

Bump bootbox version to v4.1.0
Update README.md

Added info of which gem version you should use for BS3 or BS2.
Keep dummy/db directory
Always use Rails 3.1+
Add explanation about how to run tests
Fix markup in Readme
Merge branch 'master' of github.com:rocsci/bootbox-rails

Conflicts:
	README.md