Support ClojureScript compilation of metaprob.state and metaprob.state-test

[zane]

What does this do?

Adds support for compiling the metaprob.state and metaprob.state-test namespaces to JavaScript via the ClojureScript compiler:

• Modifies metaprob.state and metaprob.state-test to be valid Clojure / ClojureScript and renames them from *.clj to *.cljc. .cljc is the extension Clojure tooling expects for cross-compileable Clojure code.
• Adds a cljstest make target that runs a new ClojureScript test suite (currently just the tests in metaprob.state-test).
• Modifies the test make target to also run the new ClojureScript test suite.
• Adds entries to the .gitignore file for JavaScript artifacts generated by the ClojureScript compiler.
• Reorganizes some of the other entries in .gitignore.
• Adds a cljsclean make target that destroys JavaScript artifacts generated by the ClojureScript compiler.

What are the pros and cons of this?

Pros

Allows us to compile these namespaces to ClojureScript.

Cons

Increases the complexity of the system.

How do I test this?

1. Run the tests via make test (or, to just run the ClojureScript tests, make cljstest).
2. Start a ClojureScript REPL with clj -Acljs -m cljs.main -re nashorn --repl (or -re node if your system has node installed, and try requiring and working interactively with metaprob.state at the REPL:

   cljs.user=> (require 'metaprob.state)
   cljs.user=> (metaprob.state/empty-state)
   {}

[jar600]

I looked over the diff. Looks fine to me. This message constitutes my review.

[alex-lew]

Modifies metaprob.state and metaprob.state-test to be valid Clojure / ClojureScript and renames them from .clj to .cljc. .cljc is the extension Clojure tooling expects for cross-compileable Clojure code.

Were there any changes to metaprob.state to make it valid Clojure/ClojureScript? It looks like the renaming was all that happened? (If so, that's awesome!) The diff looks good to me :+1:

[zane]

@alex-lew Yep! No changes for this one! That, along with the fact that it has no dependencies of its own, is why I started with it. ☺️

[jar398]

Speaks to #14