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stupid me :(

We already provide an interface for application developers, this file is outdated and thus should get removed.

Addresses No. 3 from https://github.com/owncloud/core/issues/14847

If the user does not exist this returns null and can lead to nasty bugs since the IDE is not indicating this...

Addresses No. 1 from https://github.com/owncloud/core/issues/14847

drop any fallback code related to curl - refs https://github.com/owncloud/core/pull/14838#issuecomment-78586447

It is required by other functionalities such as S2S anyways and ownCloud will fail hard at a lot of places without it.

* Original avatarcontroller migrated to the appframework
* Added DataDisplayResponse that show data inline in the browser (used
  to retrun the image)
* Removed some unneeded code
* Added unit tests for the avatarcontroller

Corrected "one invalid characters" to "one invalid character" in line 1575.