Added mapColumn function
Updated mapPotential to support N-dimensional topology (but it's too slow right now)
Renamed variables
Optimized getNeighborsND
Simplified code
Update test
Ensure inputDimensions and columnDimensions have at least 1 dimension
Cleaned up avgConnectedSpanForColumnND
Better error messages for assertions
Merge branch 'master' into issue-837
Updates nupic.core to 1a3a36e1bbf8e3a6ede51836f327f37857f18947.
Updated Doxyfile for new pip file structure
Merge pull request #986 from numenta-ci/core-update-1a3a36e1bbf8e3a6ede51836f327f37857f18947

Updates nupic.core to 1a3a36e1bbf8e3a6ede51836f327f37857f18947.
Merge pull request #985 from scottpurdy/master

A little clean up
Merge pull request #987 from rhyolight/docfix

Updated Doxyfile for new pip file structure
Fixed a few spelling mistakes in the long comment at the beginning.
Adding this so I don't lose any of my killer spelling corrections.
Fixed some typos.
Fixed some typos in the comments.
Merge pull request #989 from baroobob/master

Fixed some typos in the comments.