Add search box and progress bar

Search bar has styling to fit width of window. Progress bar as well.
Progress bar takes 1 second for first part (delay between changes in data)
and 1 more second after to represent delay before actually receiving and
displaying results.

Works on issue #4.
Add states and 'constants' to key entry

States keep track of whether currently waiting, loading, done, or empty.
Allows bar to move up and down.

Working on #4.
State-based transitions

To make less confusing, adding objects for state-based change of progress
bar. Position to come.

Part of #4.
Add to-top transition

Remove old way of doing and add css-accelerated transition of search bar
to top of screen.
Merge pull request #9 from rmtmckenzie/getting-started

Getting started