Use v7.40.0+ libvips loader methods
Separate Openslide as input vs Deep Zoom as output
Split tile-based tests into new file
Added assertions for generated tile size
Added OpenSuse 13.1 and 13.2 support in preinstall.sh script.
Added OpenSlide support in preinstall script.
Added unit tests for Deep Zoom and OpenSlide.
Perform sRGB conversion at end of pipe only
withMetadata exports profile, should not convert
Convert one fixture to sRGB to help test
Discovered while investigating #125