Unified BrainTag, attempt 1

Merged IR_Receiver code with BrainTag code via interrupt strategy. Read
the "Since the last version" second on top of code for more details.
Added BrainTagUnified

Merged the IR_reciever sketch with the main BrainTag sketch via an
interrupt. See "Since the last version" for details.
Fixed Merging issues
Merging issues, 2
This is a bad version

I'm trying to synch with the repo, so I'm just checking incorrect lines
of code.
BV 2