Create requirements.txt

from https://github.com/KienMN/JupyterHub-on-Kubernetes/blob/master/images/jupyter-hub/requirements.txt

Dockers/tensorflow-jupyterhub/requirements.txt

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+# JupyterHub's version is defined in chartpress.yaml
+
+## Authenticators
+jupyterhub-dummyauthenticator==0.3.*
+jupyterhub-firstuseauthenticator==0.12.*
+jupyterhub-tmpauthenticator==0.6.*
+jupyterhub-ltiauthenticator==0.4.*
+jupyterhub-ldapauthenticator==1.3.*
+jupyterhub-hmacauthenticator==0.1.*
+jupyterhub-nativeauthenticator==0.0.5
+mwoauth==0.3.7
+globus_sdk[jwt]==1.8.*
+nullauthenticator==1.0.*
+oauthenticator==0.11.*
+
+## Spawners
+jupyterhub-kubespawner==0.11.*
+kubernetes==10.0.*
+
+## Other dependencies
+pymysql==0.9.*
+psycopg2-binary==2.8.*
+pycurl==7.43.0.*
+statsd==3.3.*
+cryptography==2.8.*
+
+## Useful tools
+
+# py-spy is useful for profiling running hubs
+py-spy