changed "#navbar a" to "#navbar>footer>a:not(.button)"

This will only apply navbar tab styles to only tabs and not to button and button-grouped.
This will make adding buttons and grouped buttons to footer without any conflict to navbar tab buttons
ignore buttons when applying navbar tab press
add metroMenu only if sidemenu is present
fix navbar icon:before
added footer button style to match ios theme
fix navbar>footer>a
Merge pull request #537 from krisrak/navbar-button

Allow regular button and button-grouped on navbar