Added ability for a plugin to preload
Added ability for a plugin to preload

A preload function can be added to the main Object when creating a new
instance of Cenny( {plugin: 'functionAsString'} ), this will be run
before anything else takes place.

BionicClick/Argon,BionicClick/Argon,chrismoulton/Argon,loadfive/Argon,chrismoulton/Argon,loadfive/Argon