Ani 2x (#480)

* Adding ANI-2x parameters

* Moving 2x to seperate branch

* Adding ANI-2x to new branch

* Adding 2x network

* Update models.py

* Update api.rst

* Update __init__.py
Co-authored-by: Christian Devereux <cdever01@ufl.edu>
Co-authored-by: Farhad Ramezanghorbani <farhadrgh@users.noreply.github.com>

torchani/resources/ani-2x_8x/train7/networks/ANN-Cl.nnf-l3.bparam

+b-6@5~[m/cY8jܦ@45YF5PVl5ykyfL/,86J	 5>*5ytе8=5Sеs'Ĵ~4j.h;4[(5O66frնvDW>:(5ndQ/5pӵXr$4lx;5C}ʶS)$G	A4k5]֦5s)Vq4N-ja CAt6JeQ6Z$UCqkl5{zDٵA5^=ŵ62׵ϼ/hw5
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torchani/resources/ani-2x_8x/train7/networks/ANN-Cl.nnf-l4.bparam

+Զ
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torchani/resources/ani-2x_8x/train7/networks/ANN-Cl.nnf-l4.wparam

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torchani/resources/ani-2x_8x/train7/networks/ANN-F.nnf-l4.bparam

+--broken encoding: IBM420_ltr
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