register, login, some search function

changes:
* register.
* login;
* search jids by cellphone number;
* search jid, nickname, photo by cellphone number or email.
*write cellphone number or email into vcard, vcard_search when register.
`-define(NS_SEARCH_PHONELIST, <<"aft:search-phone">>).` ?

define the protocol on wiki and have a discuss first.