Bug(samples): Incorrect casing in head links.

[EisenbergEffect]

The helloworld.html file contains new references to third party libraries. The casing for the folder name does not match what is present on the disk. This causes problems on some operating systems. Please change as follows:

<link rel="stylesheet" href="/third_party/brick/brick-1.0.1.byob.css">
  <script src="/third_party/brick/brick-1.0.1.byob.js"></script>

Note: It should be all lowercase.

[tbosch]

Closing this as the code has changed too much...