Added an internal wrapper class that can wrap our DataStreams to be used in the Ogre resource API.
Added a check for the platform endianness to the cmake configuration.  MEZZ_BIG_ENDIAN or MEZZ_LITTLE_ENDIAN should be set appropriately and checked via preprocessor.
Created a PixelFormat enum, which essentially mimics the Ogre PixelFormat enum.  This enum is used to describe how bits are layed out in an image buffer.
Completed a basic version of the Image wrapper class.  Some load methods are missing along with blitting.
Minor fix to Catch after recent resource API changes.