Update for Clojure 1.6.0

- Bump clojure dependency
- Replace clojure.contrib dependency with clojure.string
- Move test to conventional location
- Remove unneeded build.xml file
Set up for Travis CI
Add Travis lozenge to readme
Ignore lein output dir
Merge pull request #3 from mtnygard/master

Update dependencies for Clojure 1.6. r=rnewman