Add a neurodocker section to the docs

[satra]

it would be good to show people how to use neurodocker to create their own environment for running nipype with various tools. it would be nice if the page made it in before the 1.0.1 release

[mgxd]

cc-ing @kaczmarj

[kaczmarj]

I can definitely help put together a neurodocker section for the docs.

[effigies]

@kaczmarj It would be good to try to get as much as possible in before the weekend so we can queue up final test builds. Do you have time to add these docs tomorrow?

[kaczmarj]

@effigies - I will do my best to do this tomorrow.