added ability to specify spatial pooler implementation in SPRegion and CLARegion
Added abilitiy to get specs for spatial pooler implemention in CLARegion
fixed _getSPClass
Merge branch 'master' of github.com:numenta/nupic into spswitch
Merge branch 'master' of github.com:numenta/nupic into spswitch
Made old spatial pooler default implementation. Added spatial implementation option to model spec
Merge branch 'master' of github.com:numenta/nupic into spswitch
Merge pull request #230 from gilsho/spswitch

Added ability to specify spatial pooler implementation (python or c++)
Merge remote-tracking branch 'upstream/master'