start of charts
get_url
added coverage svg
better graphs
beautiful!
start of charts
added coverage svg
better graphs
beautiful!
clean up
better argument validations
default .svg not .png
fix tests
Merge branch 'charts' of https://github.com/codecov/codecov.io into charts

Conflicts:
	app/base.py
	app/images.py
	app/web.py
error handling
updated requirements