v0.7.50

- Adds license for fma, moves fma to lib/fn.js
- LedControl
  - Fixes for 8x8 matrix device MAX7219
- ESC
  - Speed up for writes
- Ping
  - Minor internal tweaks
- New diagrams/breadboards
- Updates for jshint/jshintrc
- Update dependencies

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Pass through explicitly defined SerialPort objects. Fixes gh-404

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>