VeohIE: remove debug logging
YoutubeIE: Fix vevo explicit videos (closes #956)

When an age restricted video is detected it simulates accessing the video from www.youtube.com/v/{video_id}
GameSpotIE: support more urls and download videos in the best quality
YoutubeIE: new algo for length 83 (closes #1017 and closes #1016)
release 2013.07.10
YoutubeIE: show a more meaningful error when it founds a rtmpe download (related #343)
GenericIE: Detect videos from Brightcove

Brightcove videos info is usually found in an <object class="BrightcoveExperience"></object> node, this is passed to a new method of BrightcoveIE that builds a url to extract the video.
Set the playlist_index and playlist fields for already resolved video results.
BrightcoveIE: add support for playlists
GenericIE: detect more Brightcove videos

In some sites "class" contains more that BrightcoveExperience
added an IE for Ehow videos
added test for ehow
Merge remote-tracking branch 'yasoob/master'
[ehow] improve minor bits
Remove video_result helper method

Calling it was more complex then actually including the type in the video info
Add helper function find_path_attr
[arte] Fix on 2.6
[brightcove] fix on Python 2.6
[brightcove] add import
GametrailersIE: support multipart videos

Use xml.etree.ElementTree instead of re when possible