showing how to get(':)')

It is natural to try printing ':)' by character name; this fails and may be confusing. By adding get(':)'), we show how to retrieve the variable.
More informative timing in delayed binding

The example with `a %<d-% 1` is removed, since all timings are effectively zero, so the difference is not observable. Instead, wrapping the binding statement will show zero time, whereas calling `b` will demonstrate actual execution.
removed unnecessary get()
Merge pull request #335 from tonytonov/master

Getting `:)`, delayed bindings timing