Themes: Allow theming navbar bg color

Change-Id: I256afc30fc018ea752769029c5246bc7310c23a6
settings: Fix loading of some initial values

Change-Id: I41658dd8dc3f31b4463ae4d4f3cd6f480a0ccba3
Fix systemui crash on boot

The process com.android.systemui would crash after phone booting with a
java.lang.NullPointerException when the signal status style is set to text

Change-Id: Ia7b58fa93b8591d0571b90a57a2fe0fe823b3f45
Merge pull request #9 from CyanogenMod/cm-11.0

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