Pygaps

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New features:

* The plotting legend now works with any isotherm attribute specified
* Changed model parent class to print out model name when displayed
* Added Toth and Jensen-Seaton models to the IAST calculation
(spreading pressure is computed
numerically using scipy.integrate.quad, :issue:`7`)

Bugfixes:

* Fixed an issue where the returned IAST selectivity v pressure
data would not include all pressures
* Changed sqlite retrieval order to improve performance (:issue:`2`)
* Fixed an error where IAST vle data was plotted opposite to the graph axes
* Fixed a mistake in the Jensen-Seaton equation
* Fixed a mistake in the FH-VST equation

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New features:

* Allowed for branch selection for isosteric heat and fixed
an error where this was an issue (:issue:`3`)

Bugfixes:

* Fixed an issue when plotting isotherms with and without
secondary data simultaneously
* Fixed error with magnitude of polarizability of adsorbate
from database in microporous PSD

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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