Fix typescript errors

Remove rootDir from example/tsconfig.json

Inclusion was causing TS6059 'rootDir' is expected
to contain all source files error. Suggestion to remove from:
wmonk/create-react-app-typescript#74

Change tsconfig.json compiler target to es7
With target set to es6, was receiving error:
ERROR in /home/jthetzel/src/react-mapbox-gl/src/layer.ts
(206,22): error TS2339: Property 'includes' does not exist on type 'number[]'.
Suggestion to try es7:
PatrickJS/PatrickJS-starter#931 (comment)

Removing carets from devDependencies
Presume this is preferred, as master branch does not
use carets.

Author: jthetzel

example/package.json

@@ -12,8 +12,8 @@
   },
   "dependencies": {
     "immutable": "3.8.1",
-    "react": "15.6.1",
-    "react-dom": "15.6.1",
+    "react": "16.0.0",
+    "react-dom": "16.0.0",
     "react-live": "1.7.1",
     "react-router": "3.0.5",
     "styled-components": "2.1.2",

example/tsconfig.json

@@ -13,7 +13,6 @@
     "noUnusedLocals": true,
     "outDir": "./dist",
     "removeComments": true,
-    "rootDir": "./src",
     "sourceMap": true,
     "strictNullChecks": true,
     "suppressImplicitAnyIndexErrors": true,
@@ -23,4 +22,4 @@
     "node_modules",
     "static"
   ]
-}
+}

package.json

@@ -82,15 +82,15 @@
     "@types/react-test-renderer": "^15.5.4",
     "@types/recompose": "0.24.1",
     "@types/supercluster": "^2.3.0",
-    "enzyme": "^3.0.0",
+    "enzyme": "3.0.0",
     "enzyme-adapter-react-16": "^1.0.0",
-    "jest": "^21.2.0",
+    "jest": "21.2.0",
     "mapbox-gl": "0.39.1",
     "prettier": "1.7.0",
     "prop-types": "15.5.10",
-    "react": "^16.0.0",
-    "react-dom": "^16.0.0",
-    "react-test-renderer": "^16.0.0",
+    "react": "16.0.0",
+    "react-dom": "16.0.0",
+    "react-test-renderer": "16.0.0",
     "recompose": "0.25.0",
     "ts-jest": "21.0.1",
     "tslint": "5.7.0",