fix failing Window#class_names spec
remove unused MsUia::Window#element method
Merge pull request #58 from leviwilson/unused-code

Remove Unused Method
add ability to UiaDll to check the existence of an AutomationElement
replace uia Control#exist? with uia_dll version (a couple specs failing)
UiaDll includes :index as well when searching
update UiaDll#bounding_rectangle to use locators
Can get table values by FindInformation; addd ControlType method to UiaDll
remove uia_element dependency from get_current_control_type
use locator for UiaDll#process_id
use locator for UiaDll::get_name
getting class_name(s) from UiaDll uses a locator now
remove unused Window#gather_children_classes
UiaDll::is_set uses a locator
Uia::is_selected uses a locator
removed unused ListItem#uia_element
ListBox and SelectList use locators for setting and counting items
final straw in removing the uia_element :clap:
remove commented out test
another pass at removing unused uiadll methods