Use NSStatusItem button api and show empty popover window when status item is clicked.
Current entry duration in menu bar and popover

Realtime, son.
* Adds my own base resource class to make restful api calls a breeze.
* Update popover to include the current entry’s duration and some other
controls that don’t do anything.
* Adds a CurrentEntry that is basically a service in charge of polling
for changes to the current entry. It sends out a notification that the
status item and popover use to update their interfaces.
* We store entry data in an MDEntry class.
* Login creds get hard-coded
Update project/contact and start and stop timer
Save entry description when popover closes
Adds: log current entry and window for logging in