Dollar signs are deleted in article shortcode

[jimwebb]

The templating system that generates issuem articles via the [issuem_articles] shortcode uses preg_replace to substitute content for the variables entered in the admin screens (e.g., %EXCERPT%) but it doesn't quote the content first.

So, if an article has a dollar figure, like $5.00, or $1.2 trillion, the dollar signs are treated like regex substitutions and the shortcode output ends up being ".00" and ".2 trillion".

Pull request to come. Thanks!

[jimwebb]

Try this pull request instead :)