Only use strict dependencies (#2929)

Since we use greenkeeper we get PRs when there is an update

package.json

@@ -72,7 +72,7 @@
     "friendly-errors-webpack-plugin": "1.5.0",
     "glob": "7.1.1",
     "glob-promise": "3.1.0",
-    "hoist-non-react-statics": "^2.2.2",
+    "hoist-non-react-statics": "2.2.2",
     "htmlescape": "1.1.1",
     "http-status": "1.0.1",
     "json-loader": "0.5.4",
@@ -85,18 +85,18 @@
     "path-match": "1.2.4",
     "pkg-up": "2.0.0",
     "prop-types": "15.5.10",
-    "prop-types-exact": "^1.1.1",
+    "prop-types-exact": "1.1.1",
     "react-hot-loader": "3.0.0-beta.7",
-    "recursive-copy": "^2.0.6",
-    "send": "^0.15.3",
+    "recursive-copy": "2.0.6",
+    "send": "0.15.3",
     "source-map-support": "0.4.15",
     "strip-ansi": "3.0.1",
-    "styled-jsx": "^1.0.8",
+    "styled-jsx": "1.0.8",
     "touch": "3.1.0",
     "unfetch": "3.0.0",
     "url": "0.11.0",
     "uuid": "3.1.0",
-    "walk": "^2.3.9",
+    "walk": "2.3.9",
     "webpack": "3.3.0",
     "webpack-dev-middleware": "1.11.0",
     "webpack-hot-middleware": "2.18.2",
@@ -119,14 +119,14 @@
     "coveralls": "2.13.1",
     "cross-env": "5.0.1",
     "express": "4.15.2",
-    "fkill": "^5.0.0",
+    "fkill": "5.0.0",
     "husky": "0.14.3",
     "jest-cli": "20.0.4",
-    "lint-staged": "^4.0.0",
+    "lint-staged": "4.0.0",
     "node-fetch": "1.7.1",
     "node-notifier": "5.1.2",
     "nyc": "11.0.3",
-    "portfinder": "^1.0.13",
+    "portfinder": "1.0.13",
     "react": "15.5.4",
     "react-dom": "15.5.4",
     "standard": "9.0.2",