todo

[ ] pomegranate (at leat YAHMM) was [very] slow for me; but it still seems
    like a really nice package, with a clear goal, and super nice flexibility
    e.g. mixtures of HMMs, which would be awesome for hippocampal work.
    Maybe reconsider? http://pomegranate.readthedocs.io/en/latest/faq.html

    @misc{Schreiber2016,
        author = {Jacob Schreiber},
        title = {pomegranate},
        year = {2016},
        publisher = {GitHub},
        journal = {GitHub repository},
        howpublished = {\url{https://github.com/jmschrei/pomegranate}},
        commit = {enter commit that you used}
}

Read and re-interpret https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2722652/
and https://users.soe.ucsc.edu/~karplus/papers/nullmod.pdf


[ ] append AnalogSignalArrays
[ ] re-write EpochArray merge
[ ] decouple EpochArray operations from merged (complement, duration, etc.)
[ ] remove auto-merge for contiguous arrays (what was Josh's use case?)
[ ] position linearization and idealization, given segments
[ ] recompute interpolant only if hash has changed (consider adding other things to memoization)
[ ] https://stackoverflow.com/questions/1574458/python-object-that-monitors-changes-in-objects
[ ] https://stackoverflow.com/questions/22878220/looking-for-a-solution-to-detect-value-change-in-class-attribute-with-a-list-and
[ ] https://stackoverflow.com/questions/6190468/how-to-trigger-function-on-value-change
[ ] https://gist.github.com/Jim-Holmstroem/1875766
[ ] https://stackoverflow.com/questions/5386694/fast-way-to-hash-numpy-objects-for-caching