Elementium

Added
- Created new Waiter subclasses | [30826bf](https://github.com/actmd/elementium/commit/30826bf8b39bd0f754b8d6e28507701ba0e12cdb)

Changed
- Removed the helper with_update(), with_retry() functions from elements.elements.py and replaced them with the new Waiters
- Removed with_update() and with_retry() methods from the Elements classes and replaced it with a more generic, retried() method
- Reorganized and cleaned up some code

Bugfixes
- Map returns | [](https://github.com/actmd/elementium/commit/8cbfaf955aee7c8b7abc2e0e02d7ba6d7d70bff7)

Bugfixes
- Filter returns | [dbcf774](https://github.com/actmd/elementium/commit/dbcf774e6a6605f6483f75a289b4965ca3aa9362)

Bugfixes
- Wrong `self` assignment | [62721ae](https://github.com/actmd/elementium/commit/62721ae806802e45fd2fb8d8190c908a4b37072d)

Added
- Initial commit | [8472dbc](https://github.com/actmd/elementium/commit/8472dbc0614b0baa93a843802f0837cc232b1989)