First Attempt at Message Queue Module
Corrects reference to list-accounts
Refactor Managers

 * Moves managers to SoftLayer.managers
 * Moves manager tests to SoftLayer.tests.managers
 * Adds missing manager imports so that all managers are exposed as SoftLayer.ManagerClass
 * Adds missing hardware manager to the docs
 * Adds Firewall Manager Test
 * Renames capital manager modules to lowercase
 * Moves manager exceptions to SoftLayer.exceptions
 * Adds a couple missing module doc blocks
First Attempt at Message Queue Module
Corrects reference to list-accounts
Merge branch 'message-queue' of github.com:sudorandom/softlayer-api-python-client into message-queue
Merge pull request #101 from sudorandom/message-queue

Message queue