Merge pull request adafruit#23 from plamponi/pwm_freq

PWMOut variable frequency not required, uses only one counter

Merge pull request adafruit#20 from adafruit/pypi-readme

added pypi instructions to readme

ignore the board module imports in .pylintrc

Signed-off-by: sommersoft <[email protected]>

Merge pull request adafruit#16 from kattni/pypi-fix

Updated travis.yml

Merge pull request adafruit#10 from dhalbert/check_fraction_range

Check fraction range; add post-constructor access to actuation_range and pulse widths.

Merge pull request adafruit#7 from adafruit/dm-stepper

DM: explicitly set pwm freq

Merge pull request adafruit#5 from CedarGroveStudios/patch-1

Updated with additional servo specs

Improve the docs.