* Removed the automatic document table heading based on the document id.
* Fixed the way 'absolute' links were resolved in `Processor`. A leading `/` for
a link passed into `Processor.resolveLink` really means "resolve as if I am
starting from the documentation root."
* Moved the default logging configuration out of the final jar path. This is to
help with environments that have multiple projects in the same classpath and
therefore may have multiple `logback.groovy` configurations loading.
* Tweaked CSS.
* Added syntax highlighting using SyntaxHighlighter v3.0.83
(see https://github.com/alexgorbatchev/SyntaxHighlighter)
* Modified Directive to have a link to the DocBlock that contains it. Modified
JLPPegParser to account for this change.
* Modified LinkAnchor to include the ASTNode defining it. Also added
LinkAnchorType enum to facilitate different types of links.
* LiterateMarkdownGenerator is now escaping HTML characters in the code sections
and other places it is appropriate.
* Refactored the link resolution process. Added a new method
`Processor.resolveLink(String, TargetDoc)` that now resolves a URL or URL
fragment relative to the current output context. This function also takes over
the job of resolving JLP links to link anchors and generating the correct URL.
LiterateMarkdownGenerator now calls this instead of doing all the work itself.
* To support the syntax highlighter, the JarUtil class from com.jdbernard.util
is included and the syntax highlighter resources are extracted into the output
directory from a resource jar stored in the JLP main jar.
* The CSS and other assets for the output are no longer copied into every
output directory, but now stored at the output root and linked correctly into
the output files.
* Added references to the source file and file type for TargetDocs instead of
computing them on the fly during processing.
