Added control to permit moving custom sotd

Added option sotdAfterWGinfo option.   If true, then the custom sotd
paragraph will appear after the information about the working group
and comment email addresses.

This addresses issue #351.
Merge pull request #360 from w3c/p-351

Added control to permit moving custom sotd

Closes #351
Merge branch 'develop', remote branch 'origin' into develop
v3.2.29
Merge branch 'develop' into gh-pages
Merge commit '49ab69fd995b470c8560c4e3c977628297641ca6' into gh-pages

* commit '49ab69fd995b470c8560c4e3c977628297641ca6':
  v3.2.29
  Merge branch 'develop', remote branch 'origin' into develop
  Added control to permit moving custom sotd

Conflicts:
	builds/respec-w3c-common.js
	package.json