Support the ALaw compression format.

This is very similar to issue #7 except that it is about the A-Law algorithm instead of the uLaw algorithm.

I want to support this algorithm but I think that I should spin this algorithm off into a different library in the Haskell language. Maybe even a Data.Compression.ALaw package. That makes more sense to me.

I think that I can probably impliment it by following the patterns here: http://en.wikipedia.org/wiki/A-law_algorithm

I should test this out by converting to and from PCM formats for the same Wav file and then playing out the output and confirming that it still sounds the same.

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