Initial markdown writer support.
Headers writer
Additional markdown->markdown tests.
WiP
Autolinks.
Fixes to list rendering.
Updates to link escaping and writing hrules inside list.
Additional blank line between list and indented code, and two lists of same type.
New edge case to markdown parser.
Fix bug in list parsing.
Tight lists rendering fixes.
Tight lists parsing fixes.
Implicit Non-Breakable space parsing
Fixes for inline emphasis rendering.
Fix test in spec.
Moving to StringBuffer.
Moving all to StringBuffer.
Update version.