add ZDFIE and _download_with_mplayer(mms://,rtsp://)
added HypemIE

rebased, closes PR #871
style and error handling edits to HypemIE
Implement search_regex from #847
implement fallbacks and defaults in _search_regex
print WARNINGs during test + minor fix to NBAIE
raise exceptions on warnings during tests - and solve a couple of them
use search_regex in new IEs
XHamster: Can't see the description anywhere in the UI
Added Vbox7 Infoextractor
print "please report this issue on GitHub" on every ExtractorError
Merge pull request #878 from yasoob/master
Added Vbox7.com InfoExtractor and tests.
Merge pull request #853 from mc2avr/master

add ZDFIE
Set the extractor key in playlists entries

If they were videos the extractor key wasn't being set anywhere else
Closes 877
do not ask the user to report network errors
_html_search_regex with clean_html superpowers
test: extend the reach of info_dict checking

* print the info_dict in a format suitable to easy adding to tests.json during tests if un-tested fields are detected
* make it possible to put the crc32 in tests.json if the field is too long
* complete the "info_dict" fields in existing tests
* fixed the bugs catched doing this
switch long info_dict fields checking to md5
Allow unsetting the proxy with the --proxy option
Use long rtmpdump options

Note that we accidentally called rtmpdump with -v (--live) instead of -V (--verbose) because we missed this.