Feature freeze release for MPIDE 0023

This version of MPIDE 0x01000308 is officially the last major release for version 0023. We will be focusing on bringing the current core in alignment with Arduino 1.x.

We will continue on with bug fixes, and minor releases just so this version remains complete and functional. All effort from here on will be towards the Arduino 1.x features.

The reason we did this last major update is that we wanted the interrupt vector handing include in all versions of MPIDE.

Final builds will be coming soon. They will be placed on Amazon.