[New Feature][Selector] Reduces nesting in selector classes
[New Feature][Selector] Adjusts menu.html to reflect class changes for nesting tweak
[New Feature][Selector] Adjusts selector-dropdown.js to reflect class changes for nesting tweak
[New Feature][Selector] Adjusts demo index to reflect class changes for nesting tweak
[New Feature][Selector] Adjusts drop down docs to reflect class changes for nesting tweak