Added comment on Ratelimit struct.
Forgotten Media.Videos attribute
Removed not existing field from MediaVideos struct

http://instagram.com/developer/endpoints/users/
as we can see here, Video has only `low_resolution` and `standard_resolution` fields
Added authors list.
Bump version to 0.5.
Pull down upstream changes including the authors list.
Merge branch 'merge-upstream'

Pulls in upstream changes, including credits to the authors.