Messages about malformed vertices are verbose.

Else they will clutter the normal output. Also added printing of the
mesh to which the invalid vertex belongs.
Fix for SDL init and WebEmber.
Added a simple file loader.
Move script loading out from the GUIManager.

It belongs to the Application instance.
Also changed it not to rely on the Ogre resource system.
Use slightly more straightforward code.
Load any user scripts found in ~/.ember/scripts.

This allows a user to specify own scripts, which adds extra behaviour.