use the altered boldtext variable instead of the innerText property

Fixes a bug which appends extra spaces on the end of bold text segments
Added test for handling of trailing space in a "strong" element
Added Drafts functionality
Merge pull request #163 from LodewijkSioen/Drafts

Added Drafts functionality
Merge pull request #162 from dubeaud/master

added date_to_xmlschema filter to liquid engine
Merge pull request #158 from sihugh/master

HTMLToMarkdownConverter appends an extra space to strong/b elements with an existing trailing space