Initial commit of Arduino Pro Mini/Micro vitamin

Todo: All features other than header holes
Include module for Pro Mini Serial Header
Colour and extrude PCB board
Add micro USB port for Pro Micro board
Add clearance area for board components
Use ArduinoPro for module and variables prefix
Rename file to match ArduinoPro prefix
Make PCB hole diameter a default parameter
Change some variable names/comments
Merge pull request #3 from snhack/promicro_vitamin

Pro Micro vitamin