Sync with latest Maruku

Contains Ari Stern's additions for Blahtex support.

vendor/plugins/maruku/tests/unittest/pending/ref.md

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+Write a comment here
+*** Parameters: ***
+{} # params 
+*** Markdown input: ***
+[a. b] is a link.
+
+[a. b]: http://site.com/
+
+*** Output of inspect ***
+md_el(:document,[
+	md_par([md_link(["a. b"],"a_b"), " is a link."]),
+	md_ref_def("a_b", "http://site.com/", {:title=>nil})
+],{},[])
+*** Output of to_html ***
+<p><a href='http://site.com/'>a. b</a> is a link.</p>
+*** Output of to_latex ***
+\href{http://site.com/}{a. b} is a link.
+*** Output of to_md ***
+a. bis a link.
+*** Output of to_s ***
+a. b is a link.
+*** EOF ***
+
+
+
+	OK!
+
+
+
+*** Output of Markdown.pl ***
+(not used anymore)
+*** Output of Markdown.pl (parsed) ***
+(not used anymore)