Custom themes (#131)

* Adding preliminary custom themes

* Fixing Windows compatibility

https://github.com/pallets/jinja/issues/411

* Fixing template reloading and adding UI to change themes

* Explicitly closing db connections

* Themes now have custom static folders

* Closes #128

CTFd/views.py

@@ -50,7 +50,7 @@ def setup():
 
             ## Index page
             page = Pages('index', """<div class="container main-container">
-    <img class="logo" src="{0}/static/img/logo.png" />
+    <img class="logo" src="{0}/static/original/img/logo.png" />
     <h3 class="text-center">
         Welcome to a cool CTF framework written by <a href="https://github.com/ColdHeat">Kevin Chung</a> of <a href="https://github.com/isislab">@isislab</a>
     </h3>
@@ -88,6 +88,7 @@ def setup():
             db.session.add(page)
             db.session.add(admin)
             db.session.commit()
+            db.session.close()
             app.setup = False
             return redirect(url_for('views.static_html'))
         return render_template('setup.html', nonce=session.get('nonce'))