Missing definition for M_PI on Arduino 101

[terbos90803]

• Arduino board: 101

• Arduino IDE version (found in Arduino -> About Arduino menu): 1.8.4

• List the steps to reproduce the problem below (if possible attach a sketch or copy the sketch code in too): Install the DotStar library version 1.0.3 Adafruit_DotStar.cpp fails to compile with the error:

  \Arduino\libraries\Adafruit_DotStar\Adafruit_DotStar.cpp:356:53: error: 'M_PI' was not declared in this scope #define _S1_ (sin((__COUNTER__ - _SBASE_) / 128.0 * M_PI) + 1.0) * 127.5 + 0.5,

Adding a definition for M_PI before this fixes the problem and the library works fine after that.

[BillyDonahue]

Was fixed by PR #25. Library no longer references M_PI. Can probably close.