Add email service, refactor Run model to use it

api/services/EmailService.js

@@ -0,0 +1,32 @@
+// EmailService.js
+var sendgrid = require("sendgrid");
+
+exports.sendRunEmails = function(runData) {
+	var emailText =  "You've been invited to " + runData.creatorName + "'s lunch run: '"
+	            + runData.name + "'! \n\n Put in your order here:\nhttp://www.lunchrun.me/#/run/"
+	            + runData.id + "/order/";
+	var options = {
+	    from: runData.creatorName + " <" + runData.creatorEmail + ">",
+	    subject: "You've been invited to a lunch run!",
+        replyto: runData.creatorEmail
+	};
+
+	for (var idx in runData.invitees) {
+	    var invitee = runData.invitees[idx];
+	    var specificOptions = options;
+	    specificOptions.to = invitee.name + " <" + invitee.email + ">";
+	    specificOptions.text = emailText + invitee.name;
+
+	    console.log(specificOptions);
+
+        sendgrid.send(specificOptions, function(err, response) {
+	        if (err) {
+	            console.log(err);
+	        } else {
+	            console.log("message sent from: " + runData.creatorEmail);
+	        }
+	    });
+	}
+
+	transport.close();
+};