make search for users case insensitive [fixes SCI-1192]
make search for users case insensitive [fixes SCI-1192]

mlorb/scinote-web,Ducz0r/scinote-web,mlorb/scinote-web,mlorb/scinote-web,Ducz0r/scinote-web,Ducz0r/scinote-web