unquote quoted atoms to silence Elixir 1.7 warnings

[doughsay]

Elixir 1.7 produces these warnings when compileing:

==> amqp
Compiling 10 files (.ex)
warning: found quoted atom "amqp_params_network" but the quotes are not required. Quotes should only be used to introduce atoms with foreign characters in them
  lib/amqp/core.ex:44

warning: found quoted atom "amqp_params_network" but the quotes are not required. Quotes should only be used to introduce atoms with foreign characters in them
  lib/amqp/core.ex:44

warning: found quoted atom "amqp_params_direct" but the quotes are not required. Quotes should only be used to introduce atoms with foreign characters in them
  lib/amqp/core.ex:45

warning: found quoted atom "amqp_params_direct" but the quotes are not required. Quotes should only be used to introduce atoms with foreign characters in them
  lib/amqp/core.ex:45

warning: found quoted atom "amqp_adapter_info" but the quotes are not required. Quotes should only be used to introduce atoms with foreign characters in them
  lib/amqp/core.ex:46

warning: found quoted atom "amqp_adapter_info" but the quotes are not required. Quotes should only be used to introduce atoms with foreign characters in them
  lib/amqp/core.ex:46

warning: found quoted atom "amqp_msg" but the quotes are not required. Quotes should only be used to introduce atoms with foreign characters in them
  lib/amqp/core.ex:47

warning: found quoted atom "amqp_msg" but the quotes are not required. Quotes should only be used to introduce atoms with foreign characters in them
  lib/amqp/core.ex:47

Thought I'd clean it up :)

[ono]

Nice one 👍