create profile page:

* add angular model userIdentitiesStore
* add angular controller ProfileCtrl
* add resource api/user_identities/gitlab
* update rake gem
* update UserIdentitySerializer
* split Profile angular controller to two: UserProfile and UserIdentities
* unsubscribe project before destroy user_repo in User#sync_repos
* use ui.bootstrap for dropdown menus
* add spec for angular directive appCurrentUserMenu
* add spec for angular model userIdentitiesStore
* add spec for api/user_identities/gitlab controller
* fixed gitlab identities create and update
* add gitlab identity destroy
* can destroy gitlab identity
Merge pull request #14 from vexor/current_user_menu

Current user menu