Significant facelift to presenter view

* Switches to a flexbox layout. Yay!
* Cleans up remote view w/ dropdown menu.
* Allows dismissing of audience questions--just click.
* Remote view maintains connection now.
Edit the proper file

When running in review mode and attempting to edit a file with multiple
slides, this will now send you to the proper url.
Merge pull request #187 from binford2k/update/edit_proper_file

Edit the proper file
Merge pull request #186 from binford2k/update/facelift

Significant facelift to presenter view