added more metrics related content
added content for 'one thing at a time' and closing slides
added more metrics related content
Merge branch 'more-on-metrics' of github.com:adejongh/talks into more-on-metrics

* 'more-on-metrics' of github.com:adejongh/talks:
  added more metrics related content
Merge remote-tracking branch 'origin/more-on-metrics'
Merge remote-tracking branch 'origin/one-thing-and-closing'