Added support for following HW features:

Features: SW1, SW2, LED
Added .gitignore
Added 1wire source to Makefile
1wire refactoring
Added support for IPC command PERIPH_DETECT
Temporary commit for branching
Disable PCINTx
Added va_list to print_ipc
First draft for 2.4 Rev A Hardware

-Supports IPC
Supports new IPC commands

-Set voltage over IPC
-Set current limit over IPC
-Enabled external interrupt 1
Added support for MSPIM

-MSPIM (Master SPI Mode) support
-Initial driver support for MAX1168 over MSPIM
-Initial driver support for DAC (MAX5441)