PEP-8 Improvements
Enable performing element actions passing an element alias.
  - The `element_action` decorator was created
  - Manual calls for `_handle_empty_element_action` were replaced by the decorator
  - PEP-8 Improvements were made
Add installation info to README and update examples on README and wikipedia due  decorator shortcut.
Merge branch 'pmaster'

Conflicts:
	pyfunct/contrib/splinter_driver.py
Implements fill and clear actions in browsers.py
Adds tests for clear and fill actions.
Shortens the name of 'test_action_with_not_found_element'.

I believe the new name is easier to read. Moreover, it is shorter.