Added basic IP tracker functionality

views/ip/add.erb

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+<div class="row">
+  <div class="twelve columns">
+    <h1>Add new IP address</h1>
+  </div>
+</div>
+
+<div class="row">
+  <div class="twelve columns">
+    <form action="/ip-tracker/add" method="POST" class="u-full-width">
+      <div class="row">
+        <div class="six columns">
+          <label for="ip_address">IP address:</label>
+          <input class="u-full-width" type="text" placeholder="192.168.1.20" id="ip_address" name="ip_address">
+        </div>
+
+        <div class="six columns">
+          <label for="ip_dns">DNS name:</label>
+          <input class="u-full-width" type="text" placeholder="test.example.com" id="ip_dns" name="ip_dns">
+        </div>
+      </div>
+
+      <div class="row">
+        <div class="twelve columns">
+          <label for="ip_comment">Comments:</label>
+          <input class="u-full-width" type="text" placeholder="My thoughts on this address..." id="ip_comment" name="ip_comment">
+        </div>
+      </div>
+
+      <input class="button-primary u-full-width" type="submit" value="Submit">
+    </form>
+  </div>
+</div>

views/ip/ip-tracker.erb

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+<div class="row">
+  <div class="twelve columns">
+    <% if ip_addresses.length > 0 %>
+      <p><a href="/ip-tracker/add">Add new address</a></p>
+      <table class="u-full-width">
+        <thead>
+          <tr>
+            <th>Address</th>
+            <th>DNS Name</th>
+            <th>Comments</th>
+          </tr>
+        </thead>
+        <tbody>
+          <% ip_addresses.each do |ip| %>
+            <tr>
+              <td><%= ip.address %></td>
+              <td><%= ip.dns_name %></td>
+              <td><%= ip.comment %></td>
+            </tr>
+          <% end %>
+        </tbody>
+      </table>
+    <% else %>
+      <p>There are no IP addresses to show at this time. Trying <a href="/ip-tracker/add">adding some</a>.</p>
+    <% end %>
+  </div>
+</div>