Fix download bug with invalid filename
Link to code overview from changelog
Add get_subreddit_image
Add note about alternative approach to get_at_url
Move updating of _has_fetched to refresh. Fix bug.
Add get_memes_galley
Minor improvement in code clarity
Handle meme gallery urls
Handle subreddit images with short urls

I.e. it can now handle http://imgur.com/EWW1GaG in addition
to the long form http://imgur.com/r/sweden/EWW1GaG
TMP FIX: upload_image had incorrect values in resp
Add commented out get_memes_image
Add get_at_url to changelog
Deploy 0.5