Add exam sorting

Gemfile

@@ -40,6 +40,9 @@ gem 'mechanize'
 # Markdown
 gem 'redcarpet'
 
+# Table sorting
+gem 'jquery-tablesorter'
+
 group :development, :test do
   gem 'pry', '0.9.12.2'
   gem 'pry-rails', '0.3.2'

Gemfile.lock

@@ -116,6 +116,8 @@ GEM
     jquery-rails (2.2.1)
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
+    jquery-tablesorter (1.10.10)
+      railties (>= 3.1, < 5)
     jquery-ui-rails (4.1.1)
       railties (>= 3.1.0)
     json (1.8.1)
@@ -270,6 +272,7 @@ DEPENDENCIES
   factory_girl_rails (= 4.2.0)
   hirb (= 0.7.1)
   jquery-rails (= 2.2.1)
+  jquery-tablesorter
   jquery-ui-rails
   mechanize
   net-ldap

app/assets/javascripts/application.js

@@ -12,6 +12,12 @@
 //
 //= require jquery
 //= require jquery_ujs
+//= require jquery-tablesorter
 //= require turbolinks
 //= require_tree .
 //= require jquery.ui.all
+
+
+$(document).ready(function() {
+	$("#exams").tablesorter();
+});

app/views/exams/course.html.erb

@@ -2,14 +2,16 @@
 
 <div id="table">
   <table id="exams" class="table">
-    <tr>
-      <th>Semester</th>
-      <th>Instructor</th>
-      <th>Midterm 1</th>
-      <th>Midterm 2</th>
-      <th>Midterm 3</th>
-      <th>Final</th>
-    </tr>
+    <thead>
+      <tr>
+        <th>Semester</th>
+        <th>Instructor</th>
+        <th>Midterm 1</th>
+        <th>Midterm 2</th>
+        <th>Midterm 3</th>
+        <th>Final</th>
+      </tr>
+    </thead>
   <%- @results.each do |semester, instructor, exams, solutions| -%>
     <tr>
       <td>