Changes the 'npm test' to set the testing to be always UTC (to solve …

…CI issues)

package.json

@@ -10,7 +10,7 @@
     "prebuild:watch": "babel --copy-files ./components --out-dir lib --ignore *.scss,*.md -w &",
     "styleguide-server": "styleguidist server",
     "styleguide-build": "styleguidist build",
-    "test": "jest -c ./tests/jest.config.json",
+    "test": "TZ=utc jest -c ./tests/jest.config.json",
     "update-snapshots": "jest -c ./tests/jest.config.json -u",
     "cov": "jest -c ./tests/jest.config.json --coverage --no-cache",
     "coverage:coveralls": "cat ./coverage/lcov.info | coveralls",