Separate dev requirements.

requirements.txt

@@ -1,7 +1,6 @@
 CoilMQ==1.0.1
 Flask==0.12.2
 HiYaPyCo==0.4.11
-Pillow==4.3.0
 PyYAML==3.12
 arrow==0.10.0
 click==6.7
@@ -9,11 +8,7 @@ click-log==0.2.1
 gevent==1.2.2
 gunicorn==19.7.1
 lmdb==0.93
-numpy==1.14.1
-pytest==3.2.2
-pytest-flask==0.10.0
 rdflib==4.2.2
 requests-toolbelt==0.8.0
 requests==2.18.4
 stomp.py==4.1.20
-wheel==0.30.0a0

requirements_dev.txt

@@ -0,0 +1,6 @@
+Pillow==4.3.0
+numpy==1.14.1
+pytest==3.2.2
+pytest-flask==0.10.0
+sphinx-rtd-theme==0.2.4
+wheel==0.30.0a0