[WIP] Masking gaps for LSTM

[koropets]

No description provided.

[codecov]

Codecov Report

Merging #1011 into master will decrease coverage by 1.37%.
The diff coverage is 44.79%.

@@            Coverage Diff             @@
##           master    #1011      +/-   ##
==========================================
- Coverage   93.34%   91.97%   -1.38%     
==========================================
  Files          65       66       +1     
  Lines        3321     3413      +92     
==========================================
+ Hits         3100     3139      +39     
- Misses        221      274      +53     

Impacted Files	Coverage Δ
gordo/machine/dataset/preprocessor.py	38.75% <38.75%> (ø)
gordo/machine/dataset/datasets.py	94.91% <71.42%> (-1.49%)	⬇️
gordo/machine/model/factories/lstm_autoencoder.py	95.74% <77.77%> (-4.26%)	⬇️

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