search page now returns matching parts

- Searches 'name' and 'description' field
- Uses the JSON API

InvenTree/templates/search_form.html

@@ -0,0 +1,9 @@
+<div>
+<form class="navbar-form navbar-left" action="{% url 'search' %}" method='post'>
+    {% csrf_token %}
+    <div class="form-group">
+        <input type="text" name='search' class="form-control" placeholder="Search"{% if query_text %} value="{{ query }}"{% endif %}>
+    </div>
+    <button type="submit" id='search-submit' class="btn btn-default">Submit</button>
+</form>
+</div>