I had foolishly rounded to just 2 signifigant digits for decimal degrees

- I was wanting to get the JSON file size down and wasn't paying
  attention
- Changed things to round 6 signifigant digits
Fixed some jslint warnings and added in 2010 to the dropdown dataset
Made the python script more versital

- it finds the proper lat/lon column indexes rather than relying on
  hardcoded column numbers
- added a try/catch to continue in case one line of data is not valid
Fixed bug where lat/lon coords were swapped for data of less than 2011
Added historical crime data up until 2006

- this appears to be the last recorded dataset available