avoid using the libav fork of FFmpeg, as in #159
supporting both ffmpeg 1.x and libav, fix #159
using Content-Range; workaround of #160
version 0.3.10
update tests
add support for MIME type: video/quicktime
Google+: fix #161
Coursera: use http.client instead, fix #163
Coursera: handle more general form of URL
add support for Google Drive, close #165
add support for MIME type: video/x-matroska
QQ: fix #167
Google+: fix #168
Merge pull request #5 from soimort/master

sync 2013 04 25