New dataset object
Remove append and extend
add mdtraj dataset
Update commands
fix keynat for py3
argument order
make abstract
no jinja2
fix slicing and add some tests to test_commands.py
test memmap
Check fit() API
Merge pull request #319 from rmcgibbo/check-fit-api

Check fit() API
loosen failing test
Remove trailing whitespace
Merge pull request #322 from rmcgibbo/trailing-whitespace

Remove trailing whitespace
Avoid generating basesetup.pyc file in source directory
Merge pull request #323 from rmcgibbo/pyc-files-in-source

Avoid generating basesetup.pyc file in source directory
more printing, more commands
longer description
Merge pull request #325 from rmcgibbo/subparsers

command line stuff