Gruntfile fixes

Successfully configured Grunt to regenerate SASS files along with
Jekyll components.
Gruntfile fixes

Make sure that jQuery is imported before other elements
JS Reorganization

Debugged jQuery error on site. Now basic nav drop down is working
without issues. Grunt now works processes JS in the following order:
- Imports jQuery
- Imports all contents of /libs folder under /js
- concatenates and minifies all files

The output of this process is production.min.js, which is linked in the
site's _head.html file. Custom JS lives in a separate file, global.js,
which is currently not processed by Grunt. When site is production
ready, incorporating this file back into asset pipeline is worth
looking into.