Add access functions for ImagingEffectNoise with a test
test_effect_noise stalls on Travis, skip unless Windows
Remove unreachable and never completed Perlin turbulence code
Add access functions for ImagingEffectMandelbrot with a test
Add access functions for ImagingEffectSpread with a test
Test image was generated on Windows and matches on Windows, but not on Travis (Linux). Check for similar.
An epsilon of 80 should do it, getting ~79.5 on Travis
Test mandelbrot with bad arguments
Merge pull request #882 from hugovk/effects

Tests and access functions for Effects.c