3.1.3:
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* Added Mallard page status checker to yelp-check
* Added EPUB builder to yelp-build
* Changes for yelp-xsl upgrade to jQuery.syntax 3.0
* Copy images in yelp-build for e:mouseover
* Fixed HTML namespace issues in yelp-build

3.1.2:
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* Use YELP_ namespace in AC macro and variable
* Check for itstool and xmllint in build tools
* Build tools work without AM_SILENT_RULES

3.1.1:
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* Initial release