Sample project demonstrating real-world usage of Austin's browser-connected REPL support

If you're reading this on github, feel free to follow along, but it'll be a lot more fun if you clone the repo and get your hands dirty!

Austin is a really just a significant refactoring of ClojureScript's standard browser-REPL, so all of its tutorials generally apply to Austin as well. However, Austin provides a workflow that I personally find much easier to use, especially if I want to have multiple browser-connected REPLs in flight at the same time.

Running the sample app

Assuming you've cloned Austin's repo to $AUSTIN (wherever that is), do this:

cd to $AUSTIN/browser-connected-repl-sample, and run:
```
$ lein do cljsbuild once, repl
```
This will compile the dummy sample ClojureScript namespace in $AUSTIN/src/cljs, which happens to require the ClojureScript browser-REPL client-side namespace.
Once you're in the REPL (it will start up in the sample app's main namespace, cemerick.austin.bcrepl-sample), evaluate (run). That just starts jetty on port 8080; if you open a browser to that server, you'll see this page (which the sample re-uses as its only content).
Create a new Austin ClojureScript REPL environment, like so:
```
(def repl-env (reset! cemerick.austin.repls/browser-repl-env
                      (cemerick.austin/repl-env)))
```
This also reset!'s the new REPL environment into the browser-repl-env atom. The sample app uses code like this:
```
[:script (cemerick.austin.repls/browser-connected-repl-js)]
```
to drop a snippet of JavaScript into the page that will cause the browser-REPL to connect to whichever REPL environment is in browser-repl-env; your app should do likewise.
Turn your Clojure REPL into a ClojureScript REPL tied to that REPL environment with
```
(cemerick.austin.repls/cljs-repl repl-env)
```
Now that the ClojureScript REPL is ready, you need to load http://localhost:8080, or reload it if you brought it up before the REPL environment was created and reset! into the browser-repl-env atom. Once you do that, evaluate some ClojureScript to make sure your shiny new REPL is working, e.g.
```
(js/alert "Salut!")
```

You can reload your app's page as many times as you like; it will re-connect on each page load to the same REPL environment. If you want to connect to a different REPL environment, just put the it into browser-repl-env prior to loading the page you'd like to have connected to it. At some point, Austin may provide a bit of ClojureScript that will allow you to choose (from within the browser) which REPL environment to which you'd like to connect…