Removed stl containers that pybind11 takes care of

Implemented basic buffer reading functionality
Added threading for bp serialization/deserialization
Refactored MPI functionality
Engine is now a reference
Initial Read API

Removed IO Open that takes a new communicator (didn't work)

* Add initial python support to CMake build

* pybind11 2017-04-07 (1df91d36)

Code extracted from:

    https://github.com/pybind/pybind11.git

at commit 1df91d36cfa997c8987889234304ea5e37cc3e68 (v2.1.1).

* Build python bindings with cmake

* Adjust for adios2py -> adios2 module name

Applied autopep8 from python-pep8 for flake8 formatting in py

Issues:
Linking with Python 3.5 not working as-is with PyBind11
Passing a new communicator in IO Open fails (mpi4py?)

To do:
Add more test cases from other engines

Python bindings running but not printing values with bpls. Min and Max
captured correctly.

IO SetParameters and AddTransport will accept vector and map

Variable.cpp and Variable.tcc for complete separation of core components
in the public include

Updated README.md files

Python bindings now working with PyBind11

DefineVariable)

Adding Variable<void> map container in ADIOS for unknown variable types
(until Write). This is required in Python.

Added EnginePy as a thin manager wrapper to adios::Engine (member of
EnginePy)

Write accepts numpy arrays (ndarray) seamlessly

Write Outputs Verified with ADIOS 1.0 bpls

To do:
Advance