Use IntervalTimer in place of AVR timers
Use Serial & Serial1 on non-AVR platforms
Default to Uno ports if not Mega
Fix some compiler warnings
Use Serial1 in methods that sound like they should use it
Merge pull request #1 from crteensy/experimental

Use Serial1 in methods that sound like they should use it
Merge pull request #1 from PaulStoffregen/experimental

Initial (untested) effort to port to Teensy 3.1