Implement second LSTM baseline from proposal

[larocheh]

See section 4.2, second bullet point, of the initial project proposal:

https://ai-on.org/pdf/larochelle-few-shot-distribution-learning.pdf

[alexanderimanicowenrivers]

I have created pull requests for this model, as well as the corresponding config file. Could you accept them so that this issue can be closed? You will then be able to select MODEL=lstm_baseline2.yaml.
Thanks! I will perform another round of tests once it has been commited.

[leomrocha]

@acr42 Can you please merge your 3 PRs into only one? having 3 different for the same issue makes it more difficult to follow and check

[alexanderimanicowenrivers]

Ready to be merged by someone with write access @larocheh @sachinravi14 - Leo gave the OK in the pull request thread - #28