fix 00_nmatrix_spec.rb#297  # FIXME: Actually test that values are correct.
Add 2.1.1 to yaml

Bug https://github.com/SciRuby/nmatrix/issues/214
Fixed spec problem
Fix #220 by @rajatkapoor, spec by @mohawkjohn and @rajatkapoor.
Transpose of reference slices not starting at 0th entry now works
properly.