CLIMATE-370 - Add OS X install script
CLIMATE-370 - Add OS X install script

- Add OS X helper install script. Note that this uses the conda
  dependencies file for installation of some of the components. At the
  moment, specific versions aren't grabbed (just the latest versions of
  the components are).

lewismc/climate,jarifibrahim/climate,MBoustani/climate,kwhitehall/climate,riverma/climate,lewismc/climate,MJJoyce/climate,apache/climate,jarifibrahim/climate,agoodm/climate,riverma/climate,lewismc/climate,apache/climate,apache/climate,MJJoyce/climate,MBoustani/climate,kwhitehall/climate,lewismc/climate,huikyole/climate,huikyole/climate,pwcberry/climate,huikyole/climate,huikyole/climate,pwcberry/climate,pwcberry/climate,riverma/climate,pwcberry/climate,Omkar20895/climate,agoodm/climate,agoodm/climate,riverma/climate,Omkar20895/climate,MBoustani/climate,Omkar20895/climate,jarifibrahim/climate,MBoustani/climate,agoodm/climate,MJJoyce/climate,apache/climate,kwhitehall/climate,Omkar20895/climate,pwcberry/climate,MJJoyce/climate,kwhitehall/climate,jarifibrahim/climate,agoodm/climate,riverma/climate,Omkar20895/climate,huikyole/climate,MJJoyce/climate,jarifibrahim/climate,lewismc/climate,apache/climate,MBoustani/climate