Create test for multiple worlds having different cell representations

Fixes https://github.com/numenta/nupic.research/issues/32.

@subutai I realized what the problem was with this test (ABCD / DCBA), and why it was saying each predicted cell shows up in more than one sequence. Since it was allowing movement of 0 (no movement), each sequence would share the cells representing transitions from a pattern to itself. Once I disallowed movement of 0 (and set `debugSensor=True`, so no columns were shared between patterns), the test reported that each predicted active cell showed up in exactly 1 sequence. Hooray!