Fix stimulus presentation matching
Update setup.py to include numexpr, fix #101
BF: Volume2D was ignoring vmax/vmin for dim2
fixed typo in viewRGB
BF: VolumeRGB is fixed. All volumes must use same transform for now
Merge branch 'extra_layers_v2' into extra_layers
Merge branch 'master' into extra_layers
BF: VolumeRGB failed when alpha=None
fixed bug in normalization
Merge branch 'master' into extra_layers
fixed another bug in normalization
Merge branch 'master' into extra_layers
Merge branch 'extra_layers' of https://github.com/gallantlab/pycortex into extra_layers
fixed bugs in quickflat