Multisim

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* ENH: Main sim. class `Models` made directly accessible from top-level package.
* DEP: Access to `multisim.se` will be restricted in oncoming versions.
* DOC: Changelog formatting improved.
* BLD: `setup.py` tweaked for PyPI distribution.
* BLD: Package released on Github (private repo).
* BLD: `.gitignore` added

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* ENH: Import of submodules in package `__init__.py` to enable top-level access to submodules.
* ENH: `utility_functions.load_sim_results` now takes a `keys` argument to only load specific columns.
* ENH: `utility_functions.load_results_by_name` takes and passes on the `keys` result.
* ENH: `utility_functions.load_sim_results` works by concatenating columns instead of copying value arrays, increasing performance by a factor of about 30.
* DOC: Changelog description added.

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* ENH: `utility_functions.package_results` function added to allow for easy structuring of results.
* ENH: `utility_functions.load_results_by_name` convenience wrapper added for `load_sim_results` to allow easy pathless loading of structured results.

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* ENH: Added bypassing to hex_condensing_polynome to allow for massflows >> max water massflow.

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* Initial release
* All imports made relative imports
* Packaging of the simulation environment started