Develop docs azure

[ChrisRisner]

Merging updates with documentation on running training on Microsoft Azure including using a pre-configured VM image, setting up a new custom VM image, and using Azure Container Instances. This resolves issue #737

[awjuliani]

Hi @ChrisRisner,

Thanks for submitting this guide! It looks good to me, and I will be happy to merge it in.

[xiaomaogy]

Hi @ChrisRisner, have you tested your azure image with any of the environment that uses visual observation (like grid world)?

[ChrisRisner]

Hello @xiaomaogy, I haven't yet tested setting up a virtual screen in order to run testing on environments which do visual observation. I'll try to carve out some time to try this out and update the docs once I've verified it's working.

[xiaomaogy]

@ChrisRisner Also do you mind update the Azure documentation as we've migrated from Tensorflow 1.4 to 1.7.1 please? Also the cuda 8.0 no longer works with Tensorflow 1.4, only CUDA 9.0 works, so that also requires some modification. I will mark your azure documentation as only working with v0.3 for now so that it doesn't confuse people.

[ChrisRisner]

@xiaomaogy Thanks for the heads up. Will work to get this updated as soon as possible.