Style cleanup and tweaks.

Use Slim better and make formatting consistent with the rest of the
code.
Remove useless function.

microtime(true) has existed forever now, use that instead.
Don't duplicate code.

Remove duplicate data from templates.
Fix date range inputs.

They didn't work as they had the wrong names. Using the correct names
works better now.
Fix busted version of underscore.

The version that was checked in, didn't work. Add one that does.
Don't download 2 copies of underscore.