Working version of create target

Hi Jaeho, 

Just wanted you to check out where I am at. The form creates local/ssh/ssh-cluster types of targets with corresponding arguments. 

I am still working on adding a few tweaks:
1. Implementing buttons to remove rows from environment variable table in form
2. Adding some tooltips to show expected format of URLs

(As a side note, I'm unsure if it is customary to use pull requests for code that's not quite completed)