Parse incidents_with_latlongs.csv and return coordinate data

This PR add's ```geo_code.py``` which reads ```incidents_with_latlongs.csv``` file and parses address field and makes a request to grandmaster-dc api to get location co-ordinates.

Make sure ```incidents_with_latlongs.csv``` is first downloaded and kept inside python/ folder before running script. You can download ```csv``` file from [this Google Drive folder] (https://drive.google.com/folderviewid=0BytkaupSbV7SSnpBV19WcG1nQ0E&usp=sharing#list)

Once data file is downloaded run ```python geo_codes.py``` from cmd line.