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/train2/networks/ANN-H.nnf-l4.bparam

+?I
\ No newline at end of file

torchani/resources/ani-2x_8x/train2/networks/ANN-N.nnf-l3.bparam

+@˷F74$	Z㤒gr\ܸa1Bk~K*f!
+D-F8NkR'gQ6
+g|e9@SoP	04nt_O/֍4|HYu2u7и6'߸@Ϯ{4(CeDk7.
6{kv[s"+|7Ǻ1/w17`75	HVӕڹx́޷
P7( u7\% |?A=/_5% yil3{C8+JT>;c7́_78>6.
Lȸ
7@Ӹ
+ԸWk縋֭~EӐB7RJʷu
+Xи&HxRJR߸׌56`T87B7l˸E﷩i4ZKq#`Z(
\ No newline at end of file

torchani/resources/ani-2x_8x/train2/networks/ANN-N.nnf-l4.bparam

+U
\ No newline at end of file

torchani/resources/ani-2x_8x/train2/networks/ANN-O.nnf-l4.bparam

+B
\ No newline at end of file