Fail gracefully on lag_time <= 0
Add instructions for how to load datasets, objects in command line
Merge pull request #345 from rmcgibbo/instructions

Add instructions for how to load datasets, objects in command line
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