Added fixture-definitions for Stairville LED Par56 MKII RGBA/RGBW
Added new fixture-definition for Eurolite LED Par64 RGBA
Added fixture-definition for Futurelight MH 660
Merge pull request #38 from pheerai/fixtures

Added Fixtures for:
Futurelight MH660
Eurolite LED Par64 RGBA
Stairville LED Par56 MKII RGBA
Stairville LED Par56 MKII RGBW
Updated changelog and contributors