Refactored code to comply with Google Style Guides

This commit refactors JS, MD and Bash files in order to comply with the
Google style guides.

Change-Id: I5bc9a175d2400fa1095ba9eb1c8cff3ebfef4b8f
diff --git a/src/options.js b/src/options.js
index 1a321b4..5f965b9 100644
--- a/src/options.js
+++ b/src/options.js
@@ -3,25 +3,25 @@
 }
 
 const defaultOptions = {
-  "list": true,
-  "thread": true,
-  "threadall": false,
-  "fixedtoolbar": false,
-  "redirect": false,
-  "history": false,
-  "loaddrafts": false,
-  "batchduplicate": false,
-  "escalatethreads": false,
-  "movethreads": false,
-  "increasecontrast": false,
-  "stickysidebarheaders": false
+  'list': true,
+  'thread': true,
+  'threadall': false,
+  'fixedtoolbar': false,
+  'redirect': false,
+  'history': false,
+  'loaddrafts': false,
+  'batchduplicate': false,
+  'escalatethreads': false,
+  'movethreads': false,
+  'increasecontrast': false,
+  'stickysidebarheaders': false,
 };
 
 const deprecatedOptions = [
-  "list",
-  "escalatethreads",
-  "movethreads",
-  "batchduplicate"
+  'list',
+  'escalatethreads',
+  'movethreads',
+  'batchduplicate',
 ];
 
 function cleanUpOptions(options) {
@@ -43,9 +43,9 @@
 function save() {
   var options = defaultOptions;
 
-  Object.keys(options).forEach(function (opt) {
+  Object.keys(options).forEach(function(opt) {
     if (deprecatedOptions.includes(opt)) return;
-    options[opt] = document.querySelector("#"+opt).checked || false;
+    options[opt] = document.querySelector('#' + opt).checked || false;
   });
 
   chrome.storage.sync.set(options, function() {
@@ -54,16 +54,21 @@
 }
 
 function i18n() {
-  document.querySelectorAll("[data-i18n]").forEach(el => el.innerHTML = chrome.i18n.getMessage("options_"+el.getAttribute("data-i18n")));
+  document.querySelectorAll('[data-i18n]')
+      .forEach(
+          el => el.innerHTML = chrome.i18n.getMessage(
+              'options_' + el.getAttribute('data-i18n')));
 }
 
 function thread() {
-  if (document.querySelector("#thread").checked && document.querySelector("#threadall").checked) {
-    document.querySelector("#"+(this.id == "thread" ? "threadall" : "thread")).checked = false;
+  if (document.querySelector('#thread').checked &&
+      document.querySelector('#threadall').checked) {
+    document.querySelector('#' + (this.id == 'thread' ? 'threadall' : 'thread'))
+        .checked = false;
   }
 }
 
-window.addEventListener("load", function() {
+window.addEventListener('load', function() {
   i18n();
 
   chrome.storage.sync.get(null, function(items) {
@@ -71,11 +76,13 @@
 
     Object.keys(defaultOptions).forEach(function(opt) {
       if (items[opt] === true && !deprecatedOptions.includes(opt)) {
-        document.querySelector("#"+opt).checked = true;
+        document.querySelector('#' + opt).checked = true;
       }
     });
 
-    ["thread", "threadall"].forEach(el => document.querySelector("#"+el).addEventListener("change", thread));
-    document.querySelector("#save").addEventListener("click", save);
+    ['thread', 'threadall'].forEach(
+        el => document.querySelector('#' + el).addEventListener(
+            'change', thread));
+    document.querySelector('#save').addEventListener('click', save);
   });
 });