PlatformIO-based manifest file

Web: http://platformio.ikravets.com/#!/lib/show/i2cdevlib-Arduino-i2cdev
Docs: http://docs.platformio.ikravets.com/en/latest/librarymanager/index.html
Avoid trademark issues with library name

Added frameworks and platforms fields
Merge pull request #89 from ivankravets/patch-1

PlatformIO Library Manager manifest file