Pygaps

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* Automatic travis deployment to PyPI
* Improved enthalpy modelling for initial enthalpy determination
* Improved documentation

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* Fixed wrong value of polarizability for nitrogen in database
* Added a check for initial enthalpy when the isotherm is measured
in supercritical mode

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* Improved unit management by adding a unit/basis for both the
adsorbent (ex: amount adsorbed per g, kg or cm3 of material
are all valid) and loading (ex: mmol, g, kg of gas adsorbed
per amount of material are all valid)
* Separated isotherm models so that they can now be easily
created by the used.
* Added new isotherm models: Toth, Jensen-Seaton, W-VST, FH-VST.
* Made creation of classes (Adsorbate/Sample/Isotherms) more
intuitive.
* Many small fixes and improvements

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* Added unit_adsorbate and basis_loading as parameters for an isotherm,
although they currently do not have any influence on data processing

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* Slightly changed json format for efficiency

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* Better examples
* Small fixes and improvements