Now the visitor will find the last jsdoc style comment (e.g. `/** jsdoc comment */`)
before the current code item, ignoring any inline style comments (e.g. `// inline comment`)
in between.
Closes#1072
In the case that there were more than one comment blocks preceding a block of
code, the visitor was only attaching the first comment. Really what we
should do is to attach the last comment before the code block.
Peter Bacon Darwin