First functional web interface version.

- Simplify by now all html and javascript.
- Added a simple interface using go templates and plain javascript.
- Improved REST interface for the use case.
- Changed some properties into the config file to make it suitable for
future use cases.

Signed-off-by: Antonio Navarro Perez <antnavper@gmail.com>

torrent/templates/navbar.html

@@ -0,0 +1,17 @@
+<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
+    <a class="navbar-brand" href="#">Distribyted</a>
+    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav"
+        aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+    </button>
+    <div class="collapse navbar-collapse" id="navbarNav">
+        <ul class="navbar-nav">
+            <li class="nav-item">
+                <a class="nav-link" href="/">General</a>
+            </li>
+            <li class="nav-item">
+                <a class="nav-link" href="/routes">Routes</a>
+            </li>
+        </ul>
+    </div>
+</nav>