Tweak docs. [ci skip]
Use `== null` instead of a `typeof` check for `start` in `slice`.
Simplify `arguments` to array conversion in `baseCreateWrapper`.
Remove unused `assignOwnDefaults` dep from the Underscore build.
Add `baseAssign`, `baseBindAll`, `baseInvoke`, `basePick`, `basePullAt`, and `createAssigner`.