Tweak code comments. [ci skip]
Add `_.rearg`.
Make `_.defer` and `_.delay` slice `arguments` in the timeout callback.
Experiment with `_.defer` in `createHybridWrapper`.
Add Firefox 33 to sauce tests.
Cleanup `_.rearg` docs and simplify `reorder`.
Tweak `_.curry` and `_.curryRight` docs. [ci skip]
Ensure `baseAt` uses `undefined` for non-index values for array-like collections.
Remove `isArrayLike` and `isPlainObject` guards from `baseMerge`.
Make `shimKeys` style more consistent with `keysIn`.
Add test for `_.at` and non-index keys on array-like values.
Add `_.pullAt` tests.
Add `_.rearg` tests.