Add ability to load JS files from classpath

This will allow better packaging of the resources needed to run the
tests.

src/main/java/be/klak/rhino/RhinoContext.java

@@ -1,5 +1,7 @@
 package be.klak.rhino;
 
+import java.net.URL;
+
 import org.mozilla.javascript.Context;
 import org.mozilla.javascript.ContextFactory;
 import org.mozilla.javascript.Function;
@@ -86,6 +88,24 @@ public class RhinoContext {
 		// Main.processFile(this.jsContext, this.jsScope, fileName);
 	}
 
+	// {{{ loadFromClasspath
+	/**
+	 * Loads a resource from the classpath.
+	 *
+	 * @param resource the resource to resolve from the classpath
+	 */
+	public void loadFromClasspath(final String resource) {
+	    URL rsrcUrl =
+	    	Thread.currentThread().getContextClassLoader().getResource(resource);
+
+	    if (rsrcUrl == null) {
+	    	throw new IllegalArgumentException("resource " + resource + " not found on classpath");
+	    }
+
+	    evalJS(String.format("load('%s')", rsrcUrl.toExternalForm()));
+	}
+	// }}}
+
 	public Object executeFunction(ScriptableObject object, String fnName, Object[] arguments) {
 		Object fnPointer = object.get(fnName, object);
 		if (fnPointer == null || !(fnPointer instanceof Function)) {

src/test/java/be/klak/rhino/RhinoContextTest.java

@@ -80,4 +80,14 @@ public class RhinoContextTest {
         assertThat(context.evalJS("loaded")).isEqualTo(true);
         assertThat(context.evalJS("loadedTwo")).isEqualTo(true);
     }
+
+    // {{{ loadsJSFilesFromClasspath
+    @Test
+    public void loadsJSFilesFromClasspath() {
+        RhinoContext context = new RhinoContext();
+        context.loadFromClasspath("js/lib/loadsJSFilesFromClasspathTarget.js");
+
+        assertThat(context.evalJS("target.theAnswer")).isEqualTo("forty two");
+    }
+    // }}}
 }