Added functionality render sitemap.xml

Signed-off-by: Ilja <ilja@ilja-ThinkPad-W520.ctldomain.ad.local>
Switched to Pegdown Markdown processor from MarkdownJ
Allow date format used to be customised via configuration
Update Parser.java
Set default date format
Tweaked PR #66.
Merged #63.
Slightly modified PR #58.
Merged in #58
Fixes #55
Added IRC notifications.
Sitemap rendering is disabled by default so existing projects don't
error due to a missing template.
Changed Asciidoctor base dir to be folder of file being parsed so
include directives are relative to current file.
Added new var to store current path.
Cleanup imports and unused variables.
Merge pull request #81 from lefou/cleanup

Cleanup imports and unused variables.
Cleanup of imports and fixed a resource leak in Scanner.
Merge pull request #82 from lefou/cleanup-tests

Cleanup of imports and fixed a resource leak in Scanner.
Latest copy of base structure & templates.
Merge branch 'master' of https://github.com/jonbullock/JBake.git