Pull request to fix issue #303: https://github.com/energia/Energia/issues/303

https://github.com/energia/Energia/issues/303


- AnalogRead() API now uses LaunchPad pin #
- added digital_pin_to_analog_in() for all MSP430 variants inlcuding G2, F5529, FraunchPad
- added necessary definitions to Energia.h
- All legacy A0-A15 pins mapped back to LaunchPad's actual physical pins to support complete backward compatibility for all existing codes using Ax instead of actual pin #.