Ignore vim swap files.
Unix outputter: Use tabs instead of colons.

This matches the default behaviour of `cut` and causes less
escaping on the typical URY show name.

Tabs are now escaped as \t.
Corrected README example to use tabs.
Add slice pretty printer.

This formats the output of `bikesched-slice` to be human-readable.
Add filler filter.

This simply plugs any perceived gaps in a unix-formatted schedule.
Add shell script for getting today's schedule.