Major reworking of functionality with Sprockets2 support
Major reworking of functionality with Sprockets2 support

* Added support for customized external asset paths.

   i.e.:  $HOME/code/js/

* Added "debug" output on start to show external asset paths and output path.

*  Incorporated therabidbanana's "Allow multiple files, and setting options" commit.

* Incorporated cyu's "support for sprockets 2.0" commit.

guard/guard-sprockets