Improve error msg for when _num contains alphanumerics

If _num is declared don't output something about quantities.

E.g [[Has number::42a]]
MW 1.24+ / Fix Uncaught Error: Unknown dependency: jquery.json 

[skip ci]
Merge pull request #646 from SemanticMediaWiki/dv-num-err

Improve error msg for when _num contains alphanumerics
Update RELEASE-NOTES.md

[skip ci]
Another hack to get around MW 1.24+ jquery.json issue
Utils
Merge pull request #650 from SemanticMediaWiki/test-utils

Rename Util to Utils
Merge branch 'master' of ssh://wmfgerrit/mediawiki/extensions/SemanticMediaWiki