[feature] Move the manifest file format from JSON to YAML.

Pipfile

@@ -7,6 +7,7 @@ name = "pypi"
 "e1839a8" = {path = ".", editable = true}
 six = "==1.11.0"
 pyzmq = "*"
+PyYaml = "*"
 tornado = "*"
 numpy = "*"
 warlock = "*"

examples/basic.json

-{
-  "name": "basic",
-  "version": "0.0.1",
-  "app": {
-    "container": {
-      "cpus": 2,
-      "mems": 1
-    }
-  }
-}

examples/basic.yml

+name: basic
+version: 0.0.1
+app:
+  container:
+    cpus: 2
+    mems: 1

examples/singularity.json

-{
-  "name": "basic",
-  "version": "0.0.1",
-  "app": {
-    "container": {
-      "cpus": 2,
-      "mems": 1
-    }
-  },
-  "image": {
-    "path": "docker://ubuntu",
-    "type": "docker",
-    "binds": [
-      "/nix"
-    ]
-  }
-}

examples/singularity.yml

+---
+name: basic
+version: 0.0.1
+app:
+  container:
+    cpus: 2
+    mems: 1
+image:
+  path: docker://ubuntu
+  type: docker
+  binds:
+    - "/nix"

nrm/containers.py

@@ -11,7 +11,7 @@
 from __future__ import print_function
 
 from aci import ImageManifest
-from json import load
+from yaml import load
 from collections import namedtuple
 import logging
 from subprograms import ChrtClient, NodeOSClient, resources, SingularityClient