Add engine query string param

Author: gskinner

dev/src/Flavor.js

@@ -33,7 +33,7 @@ export default class Flavor extends EventDispatcher {
 	}
 
 	set value(id) {
-		let profile = profiles[id || "js"];
+		let profile = profiles[id.toLowerCase() || "js"];
 		if (!profile || profile === this._profile) { return; }
 		Track.page("flavor/"+id);
 		this._profile = profile;

dev/src/RegExr.js

@@ -59,6 +59,7 @@ export default class RegExr extends EventDispatcher {
 		this._savedHash = null;
 
 		let params = Utils.getUrlParams();
+		if (params.engine) { this.flavor.value = params.engine; }
 		if (params.expression) { this.expression.value = params.expression; }
 		if (params.text) { this.text.value = params.text; }
 		if (params.tool) { this.tools.value = {id:params.tool, input:params.input}; }