JuliaParallel / MPI.jl / 1136

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Add Buffer type, improve Datatype handling (#329)

This contains two related changes:

1. Defines a specific `Buffer` type, which contains the reference to the storage buffer, its count and datatype. This allows us to simplify the type signatures of various functions, as `count` and `datatype` no longer need to be arguments to the functions. This also adds default conversion methods for `Array`s and `Subarray`s (creating the derived datatypes where necessary, and determining the appropriate `count`s), and moves the point-to-point operations to use these conversions.

2. Improves the handling of `Datatype` handles, by making them garbage-collected objects (like other MPI handles), moves lower-level functions to a submodule, defines consistent interfaces. Also fixes #327.

I still need to move the collective calls over as well, however that will require more thought on how to handle the "chunked" operations like scatter/gather.

I also removed the inverse dictionary mappings from MPI Datatype -> Julia Type, as that is no longer so easy to determine.

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