Switch to using requirejs-hbs to load handlbars templates

Summary:
- Add requirejs-hbs plugin
- Convert existing views to use hbr! helper and not require Handlebars
- Precompile hbs templates for production
- Enable 'findNestedDependencies' to build everything into 1 file
- Convert FormTemplates to separate files and load using hbs! helper
- Only include handlebars runtime in production builds, no compiler

Test Plan:
- Run `bower update`
- Load the UI and check templates are still loading as normal.
- Run `grunt build:js` and check build runs
- Switch to production mode, load the ui and check everything is working

Reviewers: eyedol, shadowhand

Reviewed By: shadowhand

Differential Revision: https://phabricator.ushahidi.com/D195