Changed arguments taken by Sequence.join()
Fixed argument checking for export_averages method
Bug fix in frame exporting for HDF5 format.
Improved docs and tutorial.
Merge pull request #70 from pkaifosh/master

Documentation enhancements and bug fixes
Allow segment strategies to take string valued channel names.
Fixes to workflow example script.
Merge branch 'master' of github.com:losonczylab/sima