Nestpy

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Sync with [NEST v2.2.1patch1](https://github.com/NESTCollaboration/nest/releases/tag/v2.2.1patch1)

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Sync with [NEST v2.2.1](https://github.com/NESTCollaboration/nest/releases/tag/v2.2.1)
* Cleaned up MANIFEST so pypi dist packages are less bulky
[56](https://github.com/NESTCollaboration/nestpy/pull/56)
* Added floating point comparison method for equality checks
[54](https://github.com/NESTCollaboration/nestpy/pull/54)
* Random Number Generation in bindings.cpp to ensure quanta are truly randomized.
[54](https://github.com/NESTCollaboration/nestpy/pull/54)
* Binding to Kr83m yields model directly so users can specify explicity deltaT_ns between decay modes.
[55](https://github.com/NESTCollaboration/nestpy/pull/55)

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NEST v2.2.0 (no NEST changes)
* PyPi calls improved to compile for linux

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NEST v2.2.0 (no NEST changes)
* Attempted bug fix (fixed properly in 1.4.4)
* New tutorials directory

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* Bind with LUX detector file
* Fix interaction key interpretation in helpers

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Sync with v2.2.0 NEST.
Includes all files in MANIFEST.in, so that pip install will work.