Authentication with FRI ucilnica

Login to FRI ucilnica.
If user not exist, register to friTrznica users automaticly.

Vpisna_st, ime, priimek iz ucilnice

#TODO if vpisna_st not exist (on ucilnica) do something else :)
Merge pull request #24 from juree/authUcilnica

Authentication with FRI ucilnica
Merge pull request #2 from ipri2013/authUcilnica

Last version (authUcilnica) pull request from Ipri rep.