Toolbar Styling improvements PR

Several toolbar style improvements:

- Height of the toolbar is now 40px (non-retina).
- Background-color is now white #fff by default, and customizable.
- The spacing between all toolbar icons has been removed.
- The toolbar's border-top and divider color has been changed to #c8c8c8
- The toolbar icons normal color is now #7c7c7c and customizable.
- The toolbar divider line is 28px tall (non-retina), and centered.
- Active items are now tinted #0087be (the line that comes up below the icons too).
- The toolbar now collapses when editing the title, since styles can't be used.
>  I was wondering if I should be adding these colors to it at all - and if so who chooses the new names for the colors.

We want to be consistent with the colors used in the app.  If one of the existing colors isn't the right fit I think the best thing to do would be to ping either @drw158 or @hugobaeta.  They are also probably best suited to answer when a new color should be added and how the naming conventions work.