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/train4/networks/ANN-Cl.nnf-l4.bparam

+8
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torchani/resources/ani-2x_8x/train4/networks/ANN-Cl.nnf-l4.wparam

+Կ9:7
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B9Ie^:19pd?92rW:亿<M9ȹZ9=*_>@:xa:Ԃ68ǃP:M8}.9$;wn:Y:-Muj)9
\ No newline at end of file

torchani/resources/ani-2x_8x/train4/networks/ANN-F.nnf-l4.bparam

+!@
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torchani/resources/ani-2x_8x/train4/networks/ANN-F.nnf-l4.wparam

+&=d=*]:z8_8N` 	>&g]Nj8N8Z%8pO*#L:3`=5P:˯$=rr=Iw:g:}K:	o:VG>쵡Uq,:v<!<;Q):_g9y9ɮ7 Ͷ9_8xt֎C8d$>6::-:ͽ
.:Kˆq	:k5:#º0h8=NFs9ֽIvI#r::ay	9uI6>G^e=z+=&!:}HAײg:ڼ<:h<Eq,9Ag5%h/Q:Xs9йjA9H:n{ʄ=ORG9
\ No newline at end of file

torchani/resources/ani-2x_8x/train4/networks/ANN-H.nnf-l4.bparam

+6
\ No newline at end of file