Action bar layout tweaks

Fix a Spinner issue that reported odd baselines

Fix detection of expandable items for action menus and allocation of cells

Use the right asset for home-as-up in Theme.Holo.Light.SolidActionBar.Inverse

Add TextAppearance.Holo.Widget.ActionBar.Menu as a basis for further
menu item styling

Sync with design for tab/menu text appearance

Change-Id: I32026bbde1cd4e15b6cda30d78d3d48250c84c94