Add more large array tests for sortedIndex methods.
Update qunit-extras and backbone test to work with QUnit 1.16.0.
Fix QUnit hidepass display.
Cleanup `_.isEqual` benchmarks.
Clarify `_.pick` and `_.omit` docs. [ci skip] [closes #826]
Increase code coverage.
Simplify methods like `_.defer` and `_.once`.
Rebuild dist.