Eval into a cljs React Native project

[cldwalker]

There are currently 3 repls under consideration: https://github.com/mjmeintjes/boot-react-native, https://github.com/drapanjanas/re-natal and https://github.com/decker405/figwheel-react-native. The first one involves boot and since LightTable's integration so far has been with lein that seems more work than needed right now. The last two call out to figwheel. Figwheel's repl ultimately depends on piggieback which seems fairly brittle. Given that clojure 1.8 has a socket repl and figwheel seems it will eventually implement it, it seems best to hold off until socket repl integration lands. For now I'll look into integrating directly with one of the latter two repls

On the LT side: We will need to add or update a client to support :editor.eval.cljs.exec command and have evaled results integrate nicely with :editor.eval.cljs* triggers