open new task form in modal dialog

http://emberjs.com/guides/cookbook/user_interface_and_interaction/using_modal_dialogs/
Revert "open new task form in modal dialog"

This reverts commit 1dfa297c8196b6056dab1fda0b51ea5c21a8c1e3.
add some styling to new task form
another try at making the new task form modal
add creator name and fix assignee name to tasks table
intermediate commit of trying to put users in the assignee dropdown
get the users for the dropdown from the rails app
fixes to task creation
use Puma instead of Thin
allow concurency on server
add live controller on the server to send events on task refresh to browser
add listener for server sent events on the client

http://ngauthier.com/2013/02/rails-4-sse-notify-listen.html
http://tenderlovemaking.com/2012/07/30/is-it-live.html
fix layouts to accomodate different widths