Makes Timer#stop a no-op unless it has first been started.

On running rspec with no examples, the elapsed timer would receive stop, then start, resulting in an error on trying to calculate @stopped_at - @started_at.
Add an acceptance spec to mimic running fuubar with no specs
Whitespace
Add another spec which tests this in a different way
Merge branch 'jdelStrother-stopstart'

* jdelStrother-stopstart:
  Add another spec which tests this in a different way
  Whitespace
  Add an acceptance spec to mimic running fuubar with no specs
  Makes Timer#stop a no-op unless it has first been started.