Merge pull request #418 from AlekseiS/master

Fix logged messages
Fixed serialization problems with Authenticators (#417 and #416)
Updated XingProvider to work with their latest APIs (thanks @muhlig)
Fixed sequence of a and p tags.

from <a><p></a></p> to <p><a></a></p>
Merge pull request #419 from jglodek/patch-2

Fixed sequence of a and p tags.
updated change log for #419
Fixed #420: Xing provider references VkProviderSettings