IoC Support.

[steve-gray]

Basic IoC Support, including:

• New swaggerRouter optional parameter ('injected') that is passed to controller constructors.
• Ability for swaggerRouter controllers to return function(inj) from require() and have that processed.
• Updated tests to reflect and cover these changes (Users controller now requires it in test suite)
• Documentation updates reflecting all of the above.

[steve-gray]

Are the issues on this one just related to me self-enforcing eslint's comma-dangle rule? If so, can you just chop the offending dangling commas on the merge? I've got to sleep, and this is the third time I've gone through BeyondCompare trying to get things to line up since collapsing commits is the work of the git-devil.

[whitlockjc]

Let's discuss this in #337 first and merge if we decide it's necessary. My initial thoughts are that IoC is not part of the problem domain swagger-tools' middleware should be involved in, especially since swagger-router already provides a means to build your own router mapping.

[steve-gray]

Dangling commas issue fixed, hopefully. Just looking to TravisCI to confirm, but nothing seems to have picked up the need to rebuild yet.