Header Refactoring

Refactoring code/functionality between cbp-header and cbp-app-header

• Introduced cbp-toolbar to contain the common functionality
• This essentially made md-toolbar non-essential. Removed by compensating for the Accessibility.
• Removed height adjustment hacks created for md-toolbar (64px->50px hacks)
• Adjusted Demo to reflect the change for app-header (no change to cbp-header).

Additional Enhancements

• app-header to be open up "hambruger" menu for mobile just as cbp-header
• Demo application now provides XS view of main and right toolbar navigations.