Up version to 644

Merge pull request #887 from redsolution/develop

Merge Develop to Master. Release 2.6.4

Merge pull request #880 from redsolution/develop

Merge v2.6.3 (602)

Merge pull request #875 from redsolution/develop

Update 2.6.2 (591)

Merge pull request #865 from redsolution/develop

Update to 568

Merge pull request #849 from redsolution/develop

New auth interface and Xabber account

Up version to 500

Merge pull request #810 from redsolution/develop

Version 2.2.1 Beta Release

Added debug-libraries: leakcanary and blockcanary

Up version to 468