Need two backslashes in regex string.
Merge pull request #71 from jimm/master

Need two backslashes in regex string.
Identify block open/reopen/close keywords.
Add block one liner regex.

I'm not going to worry about these any more until I get the block syntax nailed.
Add heredoc regex.
Add failing test for heredoc indentation.
Fix @doc/@moduledoc syntax highlighting rules.