fix blank line handling within fenced code blocks

Merge remote-tracking branch 'cadorn/master'

* cadorn/master:
  Fix for ':' in headers
  link match fix for: (see [Concepts](../Concepts))
  markup within headers
  internal link href property fix
  fixed internal image source property name to allow href attributes for img tags using Maruku dialect
  reverted header change; use Maruku dialect for anchors instead
  added copyright for changes
  Regular expressions are no longer callable as if they were functions (ff5 & webkit) - see https://bugs.webkit.org/show_bug.cgi?id=28285
  support for HTML blocks that stay untouched
  tree node pre-processing support via options.preprocessTreeNode
  headers with anchors
  use `console.log()` instead of `print` if available
  better array detection

Conflicts:
	lib/markdown.js

Merge branch 'gfm' of github.com:WebDevBootcamp/markdown-js into gfm

* 'gfm' of github.com:WebDevBootcamp/markdown-js:
  GFM: don't start <em> mid-word.
  `md2html` supports any dialect registered in markdown.js
  TODO tests for some of the features of Github-flavoured Markdown
  Don't use arguments.callee when we have a perfectly good name
  Github-Flavoured-Markdown fenced code
  DIALECTS env var allows running feature tests for a subset of dialects

Fix for ':' in headers

link match fix for: (see [Concepts](../Concepts))

internal link href property fix