Move templating into scripts dir

There's no real need for this to be at the top level.

scripts/templating/batesian/units.py

@@ -0,0 +1,59 @@
+# Copyright 2016 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Parent class for writing units."""
+import inspect
+
+
+class Units(object):
+
+    @staticmethod
+    def prop(obj, path):
+        # Helper method to extract nested property values
+        nested_keys = path.split("/")
+        val = obj
+        for key in nested_keys:
+            val = val.get(key, {})
+        return val
+
+
+    def __init__(self, debug=False, substitutions=None):
+        self.debug = debug
+
+        if substitutions is None:
+            self.substitutions = {}
+        else:
+            self.substitutions = substitutions
+
+    def log(self, text):
+        if self.debug:
+            func_name = ""
+            trace = inspect.stack()
+            if len(trace) > 1 and len(trace[1]) > 2:
+                func_name = trace[1][3] + ":"
+            print "batesian:units:%s %s" % (func_name, text)
+
+    def get_units(self, debug=False):
+        unit_list = inspect.getmembers(self, predicate=inspect.ismethod)
+        unit_dict = {}
+        for (func_name, func) in unit_list:
+            if not func_name.startswith("load_"):
+                continue
+            unit_key = func_name[len("load_"):]
+            if len(inspect.getargs(func.func_code).args) > 1:
+                unit_dict[unit_key] = func(self.substitutions)
+            else:
+                unit_dict[unit_key] = func()
+            self.log("Generated unit '%s'" % unit_key)
+
+        return unit_dict