oembed 6.x-0.7

Fixed a couple of bugs as well as did some code style fixes.

Removed the oohEmbed provider since it's not supposed to be relied on but instead something people should install themselves and therefor has traffic problems. The introduction of Embed.ly has also made oohEmbed kind of redundant.

Changes since 6.x-0.6:

• by voxpelli: Disabled providers wasn't really disabled
• by voxpelli: Coding style fix
• by voxpelli: Removed oohEmbed provider
• by voxpelli: Updated scheme for Vimeo
• by voxpelli: Prefixed provider names of Embedly providers
• by voxpelli: Prevented endless recursion in oEmbed Provider
• by voxpelli: Improved responses for failed request to oEmbed Provider
• #890504: provider cache is always saved even if the data is from the cache.
  by bangpound: Fixed unnecessary saving of provider cache
• #890496: Adding, enabling, deleting, or disabling a provider has not effect until cache is cleared.
  by bangpound: Fixed adding, enabling etc. of a provider not clearing the provider cache
• #890490: Formatter themes don't see preprocessor functions and don't see provider-specific themes.
  by bangpound: Fixed module preprocessors not working with oEmbed Field.