add - angular / node handshake done; file gets sent, converted, zipped, ...

...sent back
messed up with git so I made this new branch. 

- if we want to convert an entire directory, we'll need to rewrite some code in the $postFile service
- the controller is a bit on the heavy side, I welcome an organization discussion! Didn't really know where to put things now.

- file automatically uploads and downloads right back to your directory, so I'll have to figure that one out