Adicionando serviço para adicionar tags, corrigindo serviço para adicionar amigos.
Merge branch 'master' of https://github.com/danielcalencar/pubshare
Modificando ShowFriendActivity, adicionando classe TagUser.
Merge http://github.com/judf/pubshare into judf-master

Conflicts:
	src/br/ufrn/dimap/pubshare/util/Constants.java
Merge pull request #59 from danielalencar/master

Merge from judf