chore: update Babel to v7

Update update and related packages to v7 beta.

Changes:
* Migrate to `@babel/*` packages
* Use `@babel/preset-env` instead of `env` preset
* Remove unecessary browserlist config in `.babelrc` config
* Update Yarn lockfiles

Author: ncoden

.babelrc

@@ -1,14 +1,3 @@
 {
-  "presets": [
-    ["env", {
-      "targets": {
-        "browsers": [
-          "last 2 versions",
-          "ie >= 9",
-          "ios >= 7",
-          "android >= 4.4"
-        ]
-      }
-    }]
-  ]
+  "presets": [ "@babel/preset-env" ]
 }