Make connection class a singleton

[roback]

close #10

• Session - The class which sets up the amqp connection (is used by Connection.instance)
• Connection.options= - can be used to set amqp hosts if they are not stored in ENV.
• Connection.instance
  • Creates a Session object the first time its called
  • Returns the same amqp connection (session.connection) each time its called

Took inspiration for the singleton pattern from http://stackoverflow.com/a/5259578

Todo

• [x] Make it possible to just require one of the classes (such as require "twingly/amqp/subscription") (9a3d4c3ee6ecb1d35736b989523ce5cb8191d2b9)

[jage]

Code looks good! I'll try this out in Imse and see if it works as expected, hang on.

[jage]

Doesn't work to just require twingly/amqp/subscriptionfor example. But with that fixed I think this can go in. Great work!

[roback]

Doesn't work to just require twingly/amqp/subscriptionfor example. But with that fixed I think this can go in. Great work!

Added that to the todo-list :)

[jage]

LGTM!