Upgrade Baselines & make MPI dependency optional

[AdamGleave]

Removed MPI from Dockerfile.

We do still need it for some algorithms (PPO1, GAIL, SAC) but we're not using these right now, so let's avoid it for now, hopefully some of the bugs will get fixed before when we next need to use it.

[codecov[bot]]

Codecov Report

Merging #22 into master will decrease coverage by <.01%. The diff coverage is 83.33%.

@@            Coverage Diff            @@
##           master     #22      +/-   ##
=========================================
- Coverage    58.3%   58.3%   -0.01%     
=========================================
  Files          57      58       +1     
  Lines        4895    4914      +19     
=========================================
+ Hits         2854    2865      +11     
- Misses       2041    2049       +8

Flag	Coverage Δ
#aprl	10.8% <0%> (-0.05%)	:arrow_down:
#modelfree	51.36% <83.33%> (+0.02%)	:arrow_up:

Impacted Files	Coverage Δ
src/modelfree/training/gail_dataset.py	100% <100%> (ø)
src/modelfree/multi/common.py	71.71% <100%> (ø)	:arrow_up:
src/modelfree/policies/base.py	85.91% <50%> (-1.05%)	:arrow_down:
src/modelfree/policies/loader.py	81.55% <60%> (-2.49%)	:arrow_down:
src/modelfree/train.py	89.28% <85.71%> (-1.07%)	:arrow_down:
src/modelfree/visualize/annotated_gym_compete.py	83.03% <0%> (-0.61%)	:arrow_down:

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