Tweaked error reporting while in development mode.

If php.ini has been set to hide errors, Radar will change this to
unhide them when the application environment is set to 'development'.
Updated Welcome message.
Changed subclass prefix.
Added URL helper.

Extends framework URL helper and will provide some functions that will
be needed in Radar relating to URLs and manipulating them.
Added File helper.

Extends core helper and will be used to verify file integrity mainly.
Add Radar's old customised Bootstrap.
Pacman loading.gif
Add Bootstrap JavaScript.