Add environment to EmbarkJS

lib/contracts/code_generator.js

@@ -139,7 +139,7 @@ class CodeGenerator {
         web3Load = Templates.web3_connector({connectionList: connectionList, done: 'done(err);', warnAboutMetamask: isDev});
       }
 
-      result += Templates.do_when_loaded({block: web3Load});
+      result += Templates.do_when_loaded({block: web3Load, environment: this.env});
     }
 
     return result;

lib/contracts/code_templates/do-when-loaded.js.ejs

@@ -1,6 +1,8 @@
 whenEnvIsLoaded(function(){
   __mainContext.__loadManagerInstance.doFirst(function(done) {
     <%- block %>
-  })
+  });
+  
+  EmbarkJS.environment = "<%- environment %>";
 });