All tests now use the current GCE input tuple including optional altitude
Updates nupic.core to 64f7abb2903120a253d634d8d15dcbca4ca8dca7.
Merge pull request #1607 from numenta-ci/core-update-sha

Updates nupic.core to latest built SHA.
Added a couple of tests for the GCE.

These tests try to make a little more clear how the GCE encodes latitude, longitude and altitude.
Merge branch 'master' into issue-1461-gce-encodes-altitude