Update requirements and Procfile

Fix #14

Procfile

@@ -1 +1 @@
-web: python app.py
+web: gunicorn app:app --log-file=-

README.md

@@ -133,7 +133,7 @@ Deploying to Heroku
 6. Create a Procfile. Open up a text editor and save the following text in it:
 
   ```
-  web: python run.py
+  web: gunicorn app:app --log-file=-
   ```
 
    Then save the file in your applications root or main directory as *Procfile* (no extension). The word "web" indicates to Heroku that the application will be attached to the HTTP routing stack once deployed.

requirements.txt

@@ -1,14 +1,16 @@
 Fabric==1.8.2
 Flask==0.10.1
 Flask-SQLAlchemy==1.0
+Flask-WTF==0.9.4
 Jinja2==2.7.2
 MarkupSafe==0.18
 SQLAlchemy==0.9.3
+WTForms==1.0.5
 Werkzeug==0.9.4
 coverage==3.7.1
 ecdsa==0.10
+gunicorn==19.3.0
 itsdangerous==0.23
 paramiko==1.12.2
 pycrypto==2.6.1
 wsgiref==0.1.2
-Flask-WTF==0.9.4