mwrd url fix for current status of river, added some pretty images
Merge branch 'master' of github.com:open-city/chicago-river-sewage
james | added xlrd to the requirements.txt file; refactored extract_sheets.py
james | small refactorings
james | renamed directory
james | all cell headings in the clean-waterway csv files are in all lowercase, use underscores instead of spaces or dashes, and have no trailing or leading spaces.  there were headings like 'pH    ' that were making data frame manipulation a pain.
james | cleaned up non-data rows from the waterway data
james | fixed algorithm for removing end rows that do not contain data
james | small renames and added 03_flattening
Scraping rain measurements from MWRD, more locations than NOAA data