Refactor and advancements

- Drops mailController, centralized in UserController
- Adds views folder for change_password
- Improves PromiseRouter to support text results
- Improves PromiseRouter to support empty responses for redirects
- Adds options to AdaptableController
- UsersController gracefully fails when no adapter is set
- Refactors GlobalConfig into same style for Routers

src/Adapters/Email/MailAdapter.js

@@ -1,5 +1,6 @@
 export class MailAdapter {
   sendVerificationEmail(options) {}
+  sendPasswordResetEmail(options) {}
   sendMail(options) {}
 }
 

src/Adapters/Email/SimpleMailgunAdapter.js

@@ -37,6 +37,19 @@ let SimpleMailgunAdapter = mailgunOptions => {
         text: verifyMessage
       });
 		},
+    
+    sendPasswordResetEmail: ({link,user, appName}) => {
+      let message =
+        "Hi,\n\n" + 
+        "You requested to reset your password for " + appName + ".\n\n" +
+        "" +
+        "Click here to reset it:\n" + link; 
+      return sendMail({ 
+        to:user.email, 
+        subject: 'Password Reset for ' + appName, 
+        text: message
+      });
+    },
     sendMail: sendMail
 	});
 }