Add verb forms related to recursion (recurse, recursed, recurses, recursing)

* http://en.wiktionary.org/wiki/recurse
* http://en.wiktionary.org/wiki/recursed
* http://en.wiktionary.org/wiki/recurses
* http://en.wiktionary.org/wiki/recursing

* http://dictionary.reference.com/browse/recurse
Merge pull request #16 from corywright/recurse

Add verb forms related to recursion (recurse, recursed, recurses, recursing)