divide requirements into base, dev and prod

Author: curious725

requirements.txt

@@ -1,2 +1,3 @@
-Django==1.9.8
-mysqlclient==1.3.10
+# This file is here because many Platforms as a Service look for
+#   requirements.txt in the root directory of a project.
+-r requirements/prod.txt

requirements/base.txt

@@ -0,0 +1,2 @@
+Django==1.9.8
+mysqlclient==1.3.10

requirements/dev.txt

@@ -0,0 +1,2 @@
+# Local development dependencies go here
+-r base.txt

requirements/prod.txt

@@ -0,0 +1,3 @@
+# Pro-tip: Try not to put anything here. There should be no dependency in
+#   production that isn't in development.
+-r base.txt