1. change overlay style maps into methods 2. make z-index ingerit from windwo 3. unit tests to verify
1. change overlay style maps into methods
2. make z-index ingerit from windwo
3. unit tests to verify

Goal of changes is to allow a client to set the 'base' z-index that a modal will use.

VIVEKLUCKY1848/livepipe-ui,eastridge/livepipe-ui,nhantam/livepipe-ui,nhantam/livepipe-ui,VIVEKLUCKY1848/livepipe-ui