REL-1914: Added flip transformation to GMOS OIWFS when using AO.
REL-2017: Added new R150 grating for GMOS-N.
Merge pull request #33 from jluhrs/features/REL-1914

REL-1914: Added flip transformation to GMOS OIWFS when using Altair.
The request had two reviews and no complains, so I'm merging it.
Merge pull request #35 from jluhrs/features/REL-2017

REL-2017: Added new R150 grating for GMOS-N.
Two reviews and no problem detected.