Replaces the $http service calls with promise based methods
of the client-side UsersService for the following:
Users Change Password
Users Manage Social Accounts
Users Password Forgot
Users Password Reset
Users Signup
Users Signin
Modifies tests to reflect changes.
Closes#1479
Changed some bad comments referencing the Articles module in other modules.
Typo fixed in xxx.client.modules.js files ("Application" => "Applicaion")
Full stop character removed at the end of line comments