Attempt to detect more false test errors.
Add `_.runInContext` doc example.
Correct .npm folder permissions in travis.yml.
Optimize `_.every` and `_.some` and cleanup `_.callback`, `_.forEach`, and `_.forEachRight`.
Avoid variable assignments in return statements.
Cleanup `optionToValue`.
Fix callback use with `_.isEqual`.
Enhance `callback` args tests for `_.clone`, `_.cloneDeep`, and `_.isEqual`.
Rebuild dist.