Initial commit of "add container" with docker hub methods

add docker hub and registry methods for interacting with public repo
authentication, and updates to ADD page coming
remove instance confirmation alert

Add confirmation alert and remove from session
Add hostnames when supplied as hostname
Simplified instance create form and lookup

This is really just the bare bones form
Basic AppInstance variable templates
Clear newAppInstance form, validation
Merge pull request #43 from ongoworks/v.0.1.3

V.0.1.3