chore(build): make travis build bower-repo for each module

This will make it so every push, travis will:

1. Check if the branch name is "master"
1. If so, go through all the modules being built
1. Checkout a repository for that module in travis's $HOME/moduleName
1. Create/update bower.json for current version
1. Create ui-$module.js and ui-$module-tpls.js
1. Create tag if not exists and push an update

This means that there will always be an up-to-date bower repo of every module matching the master and snapshot version, and a bower version will be pushed out for every module every time a new version is released.

See the README.md included for how we securely push bower repos from travis.

Now people can `bower install angular-bootstrap-ui-buttons` into their project.