Created new branch feature/0.2.0
Changed tracker version prefix from "python-" to "py-" (#51)
Added platform and tracker version to payload (#50)
Fixed versions in requirements.txt (#47)
Started validating payload in integration tests (#33)
Removed unnecessary assertion and import statements
Changed track screen view to use an unstructured event (#53)
Updated screen_view test to reflect change to unstructured event
Started sending event vendor parameter through on querystring (#55)
Removed the "URL from Cloudfront subdomain" option (#56)
Changed API to no longer specify a collector URL option (#57)
Added ability to name individual instances of the Python Tracker (#52)
Empty strings no longer added to payload
Added integration test to ensure standard_nv_pairs are correctly added to the payload (#33)
Linked the Technical Docs and Setup Guide images to the appropriate pages (#60)
Changed event vendor parameter name from "e_vn" to "evn"
Made tracker.py and payload.py compatible with Python 2.7 (#41)
run-tests.sh now runs tests for Python 3.3 and 2.7 (#42)
Verified compatibility with Python 2.7
Made unrequired tracker method arguments optional (#40) (TODO)
Added keyword arguments and parameter descriptions to track_screen_view (#40)
Fixed Pycontracts dependency (#63)