add syntax highlighting, fix tags, update examples and README

- add syntax highlighting using by CodeRay
- enable h1 title in embedded document
- preprocess {@literal *} tags before sending to Asciidoctor
- special handling for inline-only AsciiDoc output for tag content
- reorg the examples as a definition list
- add Eclipse project files to gitignore
Merge branch 'dan/syntax-highlighting-and-cleanups'

Conflicts:
	src/main/java/org/asciidoclet/Asciidoclet.java