Add runtime specifying python 3 for heroku

Copying requirements_python3 to requirements.

Have not checked if 2.7 still works or not.

requirements.txt

@@ -1,41 +1,26 @@
-Django==1.9.4
+Django==1.9.7
 Markdown==2.6.6
-Pygments==2.0.2
 amqp==1.4.9
 anyjson==0.3.3
-argparse==1.2.1
 billiard==3.3.0.23
-bleach==1.4.2
-blessings==1.6
-boto==2.38.0
-bpython==0.14.1
+bleach==1.4.3
 celery==3.1.23
-cgivar2gvcf==0.1.6
-configparser==3.5.0b2
-curtsies==0.1.19
-dj-database-url==0.4.0
+configparser==3.5.0
+defusedxml==0.4.1
+dj-database-url==0.4.1
 django-allauth==0.25.2
-django-debug-toolbar==1.4
-django-storages==1.1.8
 env-tools==2.0.0
-greenlet==0.4.7
-gunicorn==19.4.5
+gunicorn==19.6.0
 html5lib==0.9999999
-kombu==3.0.34
-mccabe==0.3
+kombu==3.0.35
 myvariant==0.2.0
-oauthlib==1.0.3
-pep8==1.5.7
+oauthlib==1.1.2
 psycopg2==2.6.1
-pyflakes==0.8.1
-python-openid==2.2.5
-pytz==2016.2
-requests==2.9.1
+python3-openid==3.0.10
+pytz==2016.4
+requests==2.10.0
 requests-oauthlib==0.6.1
-six==1.9.0
-sqlparse==0.1.19
+six==1.10.0
 tini==3.0.1
-twobitreader==3.1.0
 vcf2clinvar==0.1.4.2
-whitenoise==2.0.6
-wsgiref==0.1.2
+whitenoise==3.2

requirements_python3.txt

@@ -10,6 +10,7 @@ defusedxml==0.4.1
 dj-database-url==0.4.1
 django-allauth==0.25.2
 env-tools==2.0.0
+gunicorn==19.6.0
 html5lib==0.9999999
 kombu==3.0.35
 myvariant==0.2.0

runtime.txt

@@ -0,0 +1 @@
+python-3.5.1