TypedArrays feature-detection

### Why test for TypedArrays? We have a DataView test!

Some browsers support manipulating binary data using various views of `ArrayBuffer`s (e.g., `UInt8Array`), but do not support the more low-level `DataView` API.  Firefox, for example, does not have an implementation for `DataView` in versions <= 14 (current version).

#### References:

[Typed Arrays Specification](http://www.khronos.org/registry/typedarray/specs/latest/)
[CanIUse: TypedArrays](http://caniuse.com/typedarrays)
[Mozilla Developer Network: TypedArrays](https://developer.mozilla.org/en-US/docs/JavaScript_typed_arrays)