Update helper is_url to accept "//" something
Update lib Template to move themes to FCPATH . 'themes'
Update lib Template

* New syntax for assets
  * Now allows using assets that are stored externally using only e.g., ```//code.jquery.com``` without the protocol
  * Now finds the assets in FCPATH . 'themes/' and no longer in APPPATH . 'themes/'
* New methods to add raw assets (i.e., scripts and styles)
  * Syntax: Template::{script,style}_raw($source, $attributes, $dependencies)
Add constant ```DS``` to config 'constants.php'
Update helper ```ICF_array_helper```

Add method ```array_extend``` replacing ```prepare_arguments``` as it is more failsafe. ```prepare_arguments``` will be deprecated as of v0.5 and should not be used any longer.