Merge pull request snorkel-team#923 from HazyResearch/0.7.0-alpha

Version 0.7

Change version number.

Fixed stupid bug with version number

Merge pull request snorkel-team#708 from HazyResearch/parallel-grid-s…

…earch-issues

Parallel grid search fixes

Update README.md

Update README.md

Fix to scoring function for unlabeled = skip

Stable v0.4.alpha