Merge branch 'master' into develop
Switch to "official" Markdown library and its "Extra" version

Need of the "Extra" version to have Markdown rendering inside HTML
block-level tags.

One deleted because the official library is static and mocking a call to
a static method is painful
Trying to fix dependency issue (dev level)
Trying to fix dependency issue (dev level)
Trying to fix dependency issue (dev level)
Fix dependency issue (dev level)
Fox conflicts introduced by reverted switch another Mardown lib
Increment version to 1.4.0 - Use MarkdownExtra instead of vanilla
Merge branch 'develop'