Fail gracefully on lag_time <= 0
Reorganize utils
add files
remove file
Add progressbar for featurizer
update to the 2.3-dev version of progressbar for py3
Merge pull request #337 from rmcgibbo/lag-time-0

Fail gracefully on lag_time <= 0
merge w/ master
Merge pull request #344 from rmcgibbo/reorg-utils

Reorganize utils
merge master
Merge pull request #346 from rmcgibbo/progressbar

Progressbar
Merge branch 'master' into hdf5-dataset
typo fix