Time Tools: Use Math.abs() so elapsedTime() works with negative numbers
Time Tools: Don't use console.log any more
Time Tools: Start variable setup stuff after pageload
Time Tools: Add a basic stylesheet for now
Time Tools: Put countdown in the new div#column
Time Tools: Create a UI module that can handle having multiple timers
Time Tools: Remove the update button and automatically update the timers instead
Time Tools: Use a new roundDown() function instead of Math.floor()
Time Tools: Move createUID() to the UI module
Time Tools: Update every second only (for now)
Revert "Time Tools: Use a new roundDown() function instead of Math.floor()"

This reverts commit f46da1e78b40d3fa890bf1423c47b56b8ec592e3.
Time Tools: Instead of displaying negative times, append the string 'late'
Time Tools: Avoid multi-line strings
Time Tools: Link to Bootstrap's CSS
Time Tools: Rename "late" variable to "complete"
Time Tools: Make elapsedTime() return an object and make late times prettier
Time Tools: Use two columns in the UI (one for countdowns, another for countups)
Time Tools: Let timers be created and deleted by the user
Time Tools: Add icons
Time Tools: Refactoring