Delete old file 'srtime'

This commit only added a new file 'timer.py', without removing the old
file 'srtime.py'!

commit 267ef730c98c39cc48b7804e06d8c251c3527038
Author: Chris Cummins <chrisc.101@gmail.com>
Date:   Mon Nov 17 15:50:07 2014 +0000

    Rename 'srtime' to 'timer'
Rename 'argparser' to 'parser'

This is to prevent a namespace collision with the python argparse
package.