first stage of conference
Preparation for conference and options change
Sending packets to server
search function added
In progress: adding functions handling friend adding on server.
Merge branch 'develop' of https://github.com/alekgajos/Jamii into merge2

Conflicts:
	src/server.js
	src/srv/http/css/style-app.css
	src/srv/http/js/rest.js
fix getUserDataFromId
Merge branch 'merge2' of https://github.com/Folwarski/Jamii into mergeMF
alert with confirm
Functions to add friend on server.
js add
merged with friends
fixed searching
Finished friend-adding functions && added account_change handler.
Added temporary handler for "getUserDataFromId2".
Added the conferenceManager class for server
Merge branch 'develop' of https://github.com/matteozajac/Jamii into mergeMZ
Implemented logical conferences and broadcasting only to conference members.
Add hash support in usersDatabase

* change password format in usersDatabase - encoded sha256
* fix in usersDatabase - bad sessionID doesn't imply server crash
Logout added to connection manager.