use react 15 as a dev dep, allow react 15 or 16 as peer dependencies …

…[#157639580]

Signed-off-by: Jonathan Berney <jberney@pivotal.io>

package.json

@@ -87,8 +87,9 @@
     "postcss-cssnext": "^2.4.0",
     "prop-types": "^15.5.6",
     "proxyquire": "^1.5.0",
-    "react": "^16.0.0",
+    "react": "^15.0.0",
     "react-a11y": "pivotal-cf/react-a11y#separator-fix-dist",
+    "react-dom": "^15.0.0",
     "react-svg-loader": "^1.1.1",
     "require-dir": "^0.3.2",
     "rimraf": "^2.4.3",
@@ -123,12 +124,15 @@
     "pui-react-animation": "^1.0.2",
     "raf": "^3.1.0",
     "react-addons-shallow-compare": "^15.0.1",
-    "react-dom": "^16.0.0",
     "scroll-into-view": "^1.3.0",
     "tether": "^1.3.7",
     "through": "^2.3.8",
     "trie-search": "1.1.0"
   },
+  "peerDependencies": {
+    "react": "^15.0.0 || ^16.0.0",
+    "react-dom": "^15.0.0 || ^16.0.0"
+  },
   "scripts": {
     "pui-update": "scripts/pui-update.js",
     "test": "gulp ci --fatal"