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buffer: add indexOf method

Rodrigo Muino Tomonari requested to merge github/fork/srijs/feature/buffer-indexof into v0.12

Adds a .indexOf method to Buffer, which borrows semantics from both Array.prototype.indexOf and String.prototype.indexOf.

Buffer.prototype.indexOf can be invoked with a Buffer, a string or a number as the needle. If the needle a Buffer or string, it will find the first occurrence of this sequence of bytes. If the needle is a number, it will find the first occurrence of this byte.

Fixes #95 (closed).

If you're unsure about or not happy with the semantics, let's discuss :)

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