Be more explicit about what's included in dist/

This effectively removes the unminified versions:
 - mapbox-gl-unminified-master.js should not be leaking in the package.
 - mapbox-gl-unminified.js is redundant to the minified version with source maps.
 - mapbox-gl-unminified.js.map shouldn't be necessary.
The dev package could potentially be removed, but may be used for debug/testing/assertion build variants

package.json

@@ -160,7 +160,16 @@
   },
   "files": [
     "build/",
-    "dist/mapbox-gl*",
+    "dist/mapbox-gl-csp-worker.js",
+    "dist/mapbox-gl-csp-worker.js.map",
+    "dist/mapbox-gl-csp.js",
+    "dist/mapbox-gl-csp.js.map",
+    "dist/mapbox-gl-dev.js",
+    "dist/mapbox-gl-dev.js.flow",
+    "dist/mapbox-gl.css",
+    "dist/mapbox-gl.js",
+    "dist/mapbox-gl.js.flow",
+    "dist/mapbox-gl.js.map",
     "dist/style-spec/",
     "flow-typed/*.js",
     "src/",