All project minimum deployment target version up to 6.0
Xcode recommendations applied.
Ordered dictionary warning fixed.
VKGroup wrong used property warning fixed somehow.
Project structure edited according this Apple recommendation:
https://developer.apple.com/library/ios/technotes/iOSStaticLibraries/Articles/creating.html#//apple_ref/doc/uid/TP40012554-CH2-SW1
"... If your library target has a “Copy Headers” build phase, you should delete it; copy headers build phases do not work correctly with static library targets when performing the “Archive” action in Xcode.

Next you will add a Copy Files build phase for exporting your headers. ..."
Merge branch 'static_library_fix'