Add support for Heroku:

- Updated requirements.txt
- Add xmlsec1 buildpack

.buildpacks

@@ -0,0 +1,2 @@
+https://github.com/heroku/heroku-buildpack-python
+https://github.com/strydercorp/heroku-buildpack-xmlsec

Procfile

@@ -0,0 +1 @@
+web: gunicorn app:app

requirements.txt

@@ -1,4 +1,29 @@
 Flask==0.10.1
 Flask-Bootstrap==3.3.2.1
 Flask-Login==0.2.11
+Jinja2==2.7.3
+MarkupSafe==0.23
+Paste==2.0.2
+WebOb==1.4.1
+Werkzeug==0.10.4
+argparse==1.3.0
+cffi==0.9.2
+cryptography==0.9
+decorator==3.4.2
+enum34==1.0.4
+gunicorn==19.3.0
+idna==1.1
+ipaddress==1.0.7
+itsdangerous==0.24
+pyOpenSSL==0.15.1
+pyasn1==0.1.7
+pycparser==2.13
+pycrypto==2.6.1
 pysaml2==2.4.0
+python-dateutil==2.4.2
+pytz==2015.4
+repoze.who==2.2
+requests==2.7.0
+six==1.9.0
+wsgiref==0.1.2
+zope.interface==4.1.2