Update to django 1.9 and update pip packages (Closes #10)

- not much to say,

requirements.txt

-Django==1.7
-django-auth-ldap==1.2.1
-git+https://github.com/the-ben-waters/django-cas.git
+Django==1.9.1
+django-auth-ldap==1.2.7
 django-piwik==0.1
 django-qrcode==0.3
-django-simple-captcha==0.4.2
+django-simple-captcha==0.5.1
 flake8==2.5.1
-gunicorn==18.0
-hashids==1.0.1
+git+https://github.com/the-ben-waters/django-cas.git
+gunicorn==19.4.5
+hashids==1.1.0
 mccabe==0.3.1
 MySQL-python==1.2.5
-pep8==1.5.7
-Pillow==2.5.3
+pep8==1.6.2
+Pillow==3.1.0
 piwikapi==0.3
 pyflakes==1.0.0
-python-ldap==2.4.15
-simplejson==3.3.1
-six==1.7.3
-wheel==0.24.0
-wsgiref==0.1.2
+python-ldap==2.4.22
+simplejson==3.8.1
+six==1.10.0
+wheel==0.26.0