Log Message:
Update ruby-maruku to 0.7.2.

0.7.2

* Fix angle-bracket links starting with https:// at the beginning of a
  line. #126
* Fix error in footnote generation. #129
* Fix for ellipses dissapearing at the end of a line. #131
* Reimplement smartypants for a large overall speed improvement. #132
* #maruku_error will now respect :on_error => :ignore. #133