Install script

ADD : install script
DEL : deps folder

install script clones wiring repository to compile libwiringpi.a
update package.son
Update to libWiringPi 2.15

ADD: Constants:
- SOFT_PWM_OUTPUT
- SOFT_TONE_OUTPUT
- PI_MODEL_A
- PI_MODEL_B
- PI_MODEL_NAMES (array)
- PI_REVISION_NAMES (array)
- PI_COMPUTE_REVISION_NAMES (array)

ADD: piBoardId function
ADD: softPwmStop function
ADD: softToneStop function
fix package.json install section
remove deps folder

no longer needed
Sometimes im so dumb :/

Forgot to set constant values for SOFT_PWM_OUTPUT and SOFT_TONE_OUTPUT.

Used object notation instead of array for PI_MODEL_NAMES,
PI_REVISION_NAMES and PI_COMPUTE_REVISION_NAMES.
Merge branch 'incoming'