Require typed arrays for the tech to be supported
Typed arrays are used extensively in repackaging segments. Make sure the tech doesn't load on platforms they're not available on (e.g. IE8). Fixes #137.
Don't try to delete Uint8Array
Phantomjs doesn't like deleting window.Uint8Array so just null it to test typed array feature detection.
Merge pull request #138 from videojs/hotfix/typed-array-detection

Require typed arrays for the tech to be supported