adding additional requirements so rtd can build the documation correctly

docs/requirements.txt

@@ -3,4 +3,27 @@ Pygments>=1.2
 Sphinx>=1.3
 docutils>=0.7
 markupsafe
-sphinxcontrib-httpdomain
+sphinxcontrib-httpdomain
+Flask==0.10.1
+Flask-RESTful==0.3.3
+Flask-SQLAlchemy==2.0
+Flask-Script==2.0.5
+Flask-Migrate==1.4.0
+Flask-Bcrypt==0.6.2
+Flask-Principal==0.4.0
+Flask-Mail==0.9.1
+SQLAlchemy-Utils==0.30.11
+BeautifulSoup4
+requests==2.7.0
+psycopg2==2.6.1
+arrow==0.5.4
+boto==2.38.0  # we might make this optional
+six==1.9.0
+gunicorn==19.3.0
+pycrypto==2.6.1
+cryptography==1.0.1
+pyopenssl==0.15.1
+pyjwt==1.0.1
+xmltodict==0.9.2
+lockfile==0.10.2
+future==0.15.0