Updated validate and usage text

Updated usage task to not implicitely imply that there's a help command
(there is a -h and --help but no help <command>) Updated index file to
spit out task name as well.
Added completion script

Added that auto completes tcatch commands if sourced. Note that tcatch
has to be in your path, so either throw it in the /usr/bin directory and
the completion script into your bash completion directory or simply
source it from bash_profile or something.

It doesn't do as many fancy things as it probably could. We could
detect the current task and prompt the user to switch from it or
whatnot. It'd be an easy:

if [[ -f ~/.tc/current ]] ; then
fi

And throw stuff in. But I'm not sure how to get compgen to return
strings besides the arguments/things it's auto completeing. Yet.
Updated readme and add-info to completion.sh

Updated readme to discuss how to install timecatcher on the system and
where to place the completion script as well as how to put the binary
into your path.

Updated completion script to have the add-info script auto completion
(not much there besides the -h flag)