Emit signal for additional examples

Used to document shorthand syntax for complex params.
Switch order of example syntax

First show the plugin examples if applicable, then
show the JSON syntax.  I've also changed the section
from "Parameter Syntax" to "JSON Parameter syntax" to
distinguish the two.
Bumping version to 0.4.2
Merge branch 'release-0.4.2'

* release-0.4.2:
  Bumping version to 0.4.2
  Switch order of example syntax
  Emit signal for additional examples