Added function 'by-method' to util.clj for issue18
Use make-function in by-method
fixed :use statement in util.clj
Moved 'make-function' to util.clj
Merge branch 'master' of git://github.com/clojure-liberator/liberator

Conflicts:
	src/liberator/core.clj
recover the format
Merge pull request #23 from plucury/issue-18

Built the function `by-method` mentioned in Issue 18