* Added mobile device detection PHP library
* Call PHP library to decide which theme to use
* Added theme as a configuration option into global config
* Selectable Desktop theme (default: mmcFE)
* Selectable Mobile theme (default: mobile)
* Disable mobile theme support entirely
**NOTE**: This requires updates to the `global.inc.php` so please check
the dist file and update your config before filing a new issue!
Addresses #25
