Add ability to subset outcome transforms

[Balandat]

Addresses #708

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[codecov]

Codecov Report

Merging #711 (9c5e832) into master (f25f591) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #711   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           98        98           
  Lines         6536      6570   +34     
=========================================
+ Hits          6536      6570   +34     

Impacted Files	Coverage Δ
botorch/models/gpytorch.py	100.00% <100.00%> (ø)
botorch/models/transforms/outcome.py	100.00% <100.00%> (ø)

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[facebook-github-bot]

@Balandat has updated the pull request. You must reimport the pull request before landing.

[facebook-github-bot]

@Balandat has updated the pull request. You must reimport the pull request before landing.

[facebook-github-bot]

@Balandat has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

@Balandat merged this pull request in 550ae2d.