Remove unused files from published package (#586)

Ooooops…

Installed package size:

 - Before: 84M
 - After: 5.9M

The npmignore files are in nested folders, then they override the `files` config in package.json. It seemed difficult to change the `files` config to exclude all these things, so I opted for this instead.

examples/.npmignore

@@ -0,0 +1,2 @@
+node_modules
+package-lock.json

examples/bundled-example/.npmignore

@@ -0,0 +1 @@
+bundle.js

test/endtoend/.npmignore

@@ -0,0 +1 @@
+dist