This change adds a new "Related Courseware" section in the side
container; this section lists links to courses and talks that are
relevant to the current project page.
Relevant content is fetched by the browser, with an AJAX request sent to
the Pivotal Education LMS API. This API uses the Referrer HTTP header as
input parameter to its content selection algorithm.
Note that CORS HTTP headers are also used to allow/disallow AJAX cross
domain requests.
Remove the use if "unless contains 'not found in _includes directory'"
hacks that were previously used to detect when _includes were missing.
This change is required as the hack no longer works with the latest
Jekyll release (and therefore also with GitHub).
Additional 'custom_pom_template' and 'custom_gradle_template' flags
must now be set in _config.yml if you want to include a custom pom.xml
or build.gradle file.
