Add link to the underscore-java project.
Add link to the underscore-java project.

Underscore-java is a java port of underscore.js.
In addition to porting Underscore's functionality, Underscore-java
includes matching unit tests.

rlugojr/underscore,jdelbello/underscore,akre54/underscore,tnga/underscore-es,jpalomar/underscore,jdelbello/underscore,tnga/underscore-es,jpalomar/underscore,documentcloud/underscore,keepgoingwm/underscore,documentcloud/underscore,jashkenas/underscore,jashkenas/underscore,rlugojr/underscore,keepgoingwm/underscore,akre54/underscore