Added rate limiting logging and an error page for hitting the rate limit on opening characters

rpg-docs/client/views/meta/error/error.html

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+<template name="error">
+	<app-header-layout has-scrolling-region fullbleed>
+		<app-header class="app-grey white-text" fixed>
+			<app-toolbar>
+				<paper-icon-button icon="menu" drawer-toggle></paper-icon-button>
+			</app-toolbar>
+		</app-header>
+		<div class="fit layout vertical center center-justified">
+			<div class="paper-font-subhead"
+				style="margin-left: 16px;
+				margin-right: 16px;
+				text-align: center;">
+				{{#if errorMessage}}
+					<div>{{errorMessage}}</div>
+					<paper-button class="try-again">Try Again</paper-button>
+				{{/if}}
+			</div>
+		</div>
+	</app-header-layout>
+</template>

rpg-docs/client/views/meta/error/error.js

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+Template.error.onRendered(function(){
+	const error = Session.get("error") || {};
+	if (error.href) window.history.replaceState("", "", error.href);
+});
+
+Template.error.helpers({
+	errorMessage: function(){
+		const error = Session.get("error") || {};
+		return error.reason;
+	},
+});
+
+Template.error.events({
+	"click .try-again": function(event, instance){
+		window.location.reload();
+	},
+});