Follow Easy XMPP recommendations in development process

[Alexey Korepov]

XMPP provide list of recommendations for Jabber clients https://wiki.xmpp.org/web/Easy_XMPP that must do Jabber clients more user-friendly.

Please try to implement now most of described features, and follow this recommendations in future development.

[Alexey Korepov]

Here is separate feature requests for most wanted features: https://bitbucket.org/whoernet/wime/issues/6/implement-easy-group-chats-via-muc-and-mix https://bitbucket.org/whoernet/wime/issues/7/implement-easy-roster-invitations