Store/Open deployment files

[sebgoa]

From @CelsoSantos on June 9, 2017 11:10

I would like to have Cabin be able to work with yams deployment files, namely storing them in the app, allow editing of deployment files, etc. This would greatly ease work on Kubernetes with Cabin.

Also, consider adding a kubectl capable shell.

Copied from original issue: skippbox/cabin-issues#25

[remstos]

This can be a new feature, the deploy tab could include another view where you can add deployment files (copy/paste text, download from url), list them and use them just like charts. Seems like a lot of k8s apps simply provide a deployment file in their readme to install it, this makes sense to be able to install through Cabin directly.