Added test for numbered list with code
implemented GFM basics. tables are moved to branch
tests for gfm tables
fixed inline html parsing
tests and minor bug fixes
html encode links
html tests
improved headings and empty lines
fixed spacing around list markers
Merge pull request #9 from samdark/github-list-test

Added test for numbered list with code
started implementing lazy lists
validate headline depth < 7
fixed inconsitencies with lazy lists

fixes #11
ensure <hr> tags work correctly
tests for <hr>
added link reference support

fixes #2
small fixes
preserve tabs in code i.e. do not replace tabs with spaces

fixes #3
work around hhvm undefined constant issue

fixes #14
typo