Externalized and fixed up Respec configuration
Merge pull request #5 from whatwg/config_fixes

Externalized and fixed up ReSpec configuration. As none of this is particularly controversial, I'm just going to merge.
converted spec to use markdown where possible (closes #3)
added markdown support in configuration
Merge branch 'markdown_convert' of https://github.com/whatwg/serial into markdown_convert

Conflicts:
	respecConfig.js