move manifest to single jinja template

uses the same pattern as other apps. Infers route based on app name,
you can declare more in the dict at the top if you need to.

scripts/generate_manifest.py

@@ -1,63 +0,0 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-import os
-import sys
-
-import json
-import yaml
-
-
-def merge_dicts(a, b):
-    if not (isinstance(a, dict) and isinstance(b, dict)):
-        raise ValueError("Error merging variables: '{}' and '{}'".format(
-            type(a).__name__, type(b).__name__
-        ))
-
-    result = a.copy()
-    for key, val in b.items():
-        if isinstance(result.get(key), dict):
-            result[key] = merge_dicts(a[key], b[key])
-        else:
-            result[key] = val
-
-    return result
-
-
-def load_manifest(manifest_file):
-    with open(manifest_file) as f:
-        manifest = yaml.load(f)
-
-    if 'inherit' in manifest:
-        inherit_file = os.path.join(os.path.dirname(manifest_file), manifest.pop('inherit'))
-        manifest = merge_dicts(load_manifest(inherit_file), manifest)
-
-    return manifest
-
-
-def load_variables(vars_files):
-    variables = {}
-    for vars_file in vars_files:
-        with open(vars_file) as f:
-            variables = merge_dicts(variables, yaml.load(f))
-
-    return {
-        k.upper(): json.dumps(v) if isinstance(v, (dict, list)) else v
-        for k, v in variables.items()
-    }
-
-
-def paas_manifest(manifest_file, *vars_files):
-    manifest = load_manifest(manifest_file)
-    variables = load_variables(vars_files)
-
-    for key in manifest.get('env', {}):
-        if key in variables:
-            manifest['env'][key] = variables[key]
-
-    return yaml.dump(manifest, default_flow_style=False, allow_unicode=True)
-
-
-if __name__ == "__main__":
-    print('---')  # noqa
-    print(paas_manifest(*sys.argv[1:]))  # noqa