added gamma closes #21 & moved viewport from yage-rendering
tidy up
moved Transformation from yage-rendering
added hdr exposures to shader uniforms
added semi bloom and single downsamplepass
ghc-make files
new HasRectangle instances and downsampling
make use of passPreset
hdr & defined some sampling
changed quadric attenuation to implicit
closes #14 : complete hdr render pipeline
Merge branch 'feature/hdr-rendering' into development