Add requirements file for RTD.

requirements_rtd.txt

@@ -0,0 +1,20 @@
+CoilMQ==1.0.1
+Flask==0.12.2
+HiYaPyCo==0.4.11
+Pillow==4.3.0
+PyYAML==3.12
+arrow==0.10.0
+click-log==0.2.1
+click==6.7
+gevent==1.2.2
+gunicorn==19.7.1
+lmdb==0.93
+numpy==1.14.1
+pytest-flask==0.10.0
+pytest==3.2.2
+rdflib==4.2.2
+requests-toolbelt==0.8.0
+requests==2.18.4
+sphinx-rtd-theme==0.2.4
+stomp.py==4.1.20
+wheel==0.30.0a0