public async Task <DictModel> Login(string email, string password)
{
DictModel dict = new DictModel("user");
dict.Add("email", email);
dict.Add("password", password);
DictModel response = await MakeRequestAsync(Globals.SESSIONS_URI, dict, RequestMethod.POST);
response.EnsureValid();
string authentication_token = response.d("user").s("authentication_token", true);
RegisterAuthenticationToken(authentication_token);
return(response);
}