Add Rest.li (http://rest.li) Formula.

Rest.li is a java/scala REST framework under the apache 2.0 license.  It's sponsored by linkedin.  This is a formula for it's command line tool.

I've reviewed the Acceptable-Formulae.  I believe we meet the criteria,  no dups,  the project is fairly large and mature, has a community of developers.   Feedback welcome.

Disclamer: I work at linkedin and am a major contributor to the project, but am not the sole author.