Temporarily ignore content-owner specs in Travis

During the last 48 hours, YouTube API has being responding with
unexpected and undocumented errors to the content-owner endpoints.
Since some pull requests are waiting for tests to pass on Travis CI and
do not touch the content-owner component at all, those tests are
temporarily skipped to allow those PRs to be accepted. This will cause
code coverage to go down, but it's a temporary fix waiting for YouTube
API to work again.
Merge branch 'temporarily-skip-content-owner-specs'
Added LiveStream attributes to video
Merge pull request #51 from Fullscreen/add-live-streaming-detail

Added LiveStreamDetail attributes to video
Previously Video#update could only update snippet parameters such
as title, description. After this commit, status parameters can be
updated as well.

Unfortunately, YouTube does not let users update most of the status
parameters through the API: only privacyStatus, publicStatsViewable
and publishAt can indeed be updated.
Merge pull request #53 from Fullscreen/update-video-status

Update video status
Allow angle brackets when editing videos/playlists

Angle brackets are not characters allowed by YouTube, but instead
of failing, Yt replaces them with Unicode characters that look very
similar and are accepted by YouTube.
Allow angle brackets when creating playlists

Angle brackets are not characters allowed by YouTube, but instead
of failing, Yt replaces them with Unicode characters that look very
similar and are accepted by YouTube.

While the previous commit focused on the "update" action, this commit
focuses on the "insert" action. For now, Yt only allows insertion of
playlists and playlist items, and the latter do not have a snippet, so
the code only changes for playlists, but the code has been restructured
so it will allow to do the same when new #insert methods are added.