Similar to the dark theme, but dropping blue in favour of very dark shades of
grey.
Removed colorEdgeEffect to simplify the sharing of the style between dark and
night themes. It should default to colorPrimary anyway, so we're good.
Fixes#345.
Apply the accent color to EditTextPreference and ListPreference. They
use android.app.AlertDialog.Builder, not
android.support.v7.app.AlertDialog.Builder, so the theme has to be
specified using "android:alertDialogTheme" attribute in addition to
AppCompat's "alertDialogTheme". For the same reason those dialogs won't
be tinted on pre-Lollipop Android versions.
The Toolbar is the new thing from Google which acts as an ActionBar.
It is not a special view like the action bar is, it is
implemented and added to your layout the same as any view.
The InnerView classes of the swap workflow have the choice of what
colour to make the toolbar, so that they can distinguish themselves
as per the mockups (some deep blue, others bright blue).
Added icons for close, but they don't do anything yet.
Minor tweaks to layout so that it looks more like the latest mockups.
