Add bower support for managing JS libs

Summary:
* Add bower.json and .bowerrc files
* Load as many existing libraries as possible from bower
* remove old libs
* Update Gruntfile paths
* Update Init.js with new paths
* Update index.php view for new path to requirejs
* Remove foundation SCSS
* Remove unneeded plugins

Test Plan:
- `npm install -g bower`
- `bower install`
- Run `grunt build` and confirm everything still builds
- Load the UI and confirm all dependencies load

Reviewers: shadowhand

Reviewed By: shadowhand

Differential Revision: https://phabricator.ushahidi.com/D121