starting work with python's quantities library
new version of lesson 2, introducing conditionals and loops
some ideas for introducing conditionals but they're all kludgy
starting new module section using windspeed and turbine placement example
committing new directory structure to wind branch
adding fake wind data (for now)
moving turbine example to its own self-contained lesson
general form of lesson created, needs more writing and real data
adding wind datasets for analysis
removing wonky data files
added explanation for using glob read filenames
corrected datasets so that they're in meters-per-sec not tenths of meters-per-sec
fixed missing row in csv
added more explanation and context for exercise.  removed all code examples that lacked context
removed date strings from data files as plotting dates in matplotlib is more trouble than they need in the 2nd lesson
finished full draft with little challenges at the end
changed function names to follow PEP8 naming convention
Merge pull request #26 from barbagroup/windspeed

Windspeed