Update to roi.mask
bug fix in setup.py
Switched conda to miniconda in .travis.yml
Revert "bug fix in setup.py"

This reverts commit 4fa257d34827b25072247f60de77e613cb54e9c3.
Clean up .travis.yml
added cython step to INSTALL.rst
Sequence.join() staticmethod
Merge branch '3D_SIMA' of github.com:losonczylab/sima into 3D_SIMA
Loading of datasets saved with version 0.x

Not all sequence formats have been implemented yet.
fixed ImagingDataset.__getitem__ method for slicing of datasets
fixed imaging tests
NOTE: These will not pass until we update the example data with a 3D imaging dataset.
Marked indexing doctests to be skipped.
Bug fix in _Joined_Sequence
Forced hmm test to run with 1 process
Added n_processes parameter to hmm().
Changed ImagingDataset._save to ImagingDataset.save
Loading of old version datasets.
Test case fix.
PEP8 fixes
.travis.yml changes