Added transition from "Start" to "Stop" text.

- Added some CSS classes to accomplish this.
- Changed startControlTransition to doControlTransition and utilized aforementioned classes.
- Changed button background color transition to be a bit slower.
- The "Stop" text comes in from the bottom a bit slow, or maybe just starts too low. It looks a little off to me, but haven't figured out why yet. Improvements could be made here.
Merge branch 'master' of https://github.com/Bates550/teatime
Removed number input spinners for FF and cleaned up some code.

- Got rid of some old commented out stuff.
- Made a class for fade-in/out. Not sure how much of this can be reused, since the positioning is mostly specific to the Start/Stop button.
- Changed doControlTransition() in an effort to make it prettier.