Replace old Collections tab and Media tabs by a new unique view

[abrahammartin]

The new view should include:

• A search bar (prominent) that will search on different fields of the media item and channels.
• By default before the search bar, "last modified" media items and channels (channels with new content) will be shown next to the search bar (last 10 for each)
• Results will be separated by collections/channels and media items results
• Basic filtering options available (order by: date modified, date created, title, media length, etc). Check youtube options.
• Search bar highlighted (cursor on) by default

[abrahammartin]

Moved to https://github.com/uisautomation/sms-webapp/issues/58