add Access-Control-Allow-Origin header to API
Handle allowed CORS requests origins
Implement Allow-Methods and Allow-Headers, refactor isOriginAllowed
Merge pull request #111 from hybridgroup/176-cors-header

176 cors header
Tests for I2C
Merge pull request #112 from hybridgroup/152-i2c-test-coverage

Tests for I2C
DigitalWrite works on most pins

Digital write works

Add PWMWrite

Add AnalogRead

Refactor edison adaptor

Enable more digital pins

Enable all digital pins

Add i2c support

Properly close i2c device

Restore proper examples

Add test stub

Add Edison README