Fixing fenced code blocks to allow classes to be added. Also the newline callback regex seemed to not be working, so I removed the ^ character from before \n.
Fixing CSS class regex.
Restoring newline callback to correct original format.
Adding ability to add attributes to code blocks. See function comment for syntax.
Updating fenced code blocks as per discussion in issue #7.
Updating HTML hashing for fenced code blocks.
Refactoring of the header attribute parser in a more generic "Extra Attribute Parser".
Added support for fenced code block (refactored while merging).

Merge remote-tracking branch 'coreyworrell/extra' into extra
Updated readme to talk about attributes on fenced code blocks.
Typo.
Adjustments to fenced code block configuration variable names; added parser-object variables too.