v0.3.0: Hardware tests, timing tweaks, future features

Non-locking, optionally looping gradients completed. Fixed input buffer management, improved code structure. Still needs to be fine-tuned; at 60 ticks per gradient cycle, longer gradients are visibly choppy.

Commands in this release:

Set a constant color value: "V#FFFFFF"
Make gradient pulses between two colors: "G#000000:#FFFFFF:pulseTime"
Loop between two colors: "L#000000:#FFFFFF:pulseTime"

v0.2.2: Improved gradient behavior.

Locking gradients functional; DFRobot LED shield supported.

v0.2.1: .51: Debug option, timeout

Single-color functionality; debug mode added.

v0.2: Version .5; single-color functionality

Single-color "V#FFFFFF" functionality. Grove LED driver only.