Bug 1046212 - Rename tabspanel package to simply tabs (r=mcomella)

--HG--
rename : mobile/android/base/tabspanel/PrivateTabsPanel.java => mobile/android/base/tabs/PrivateTabsPanel.java
rename : mobile/android/base/tabspanel/RemoteTabsContainerPanel.java => mobile/android/base/tabs/RemoteTabsContainerPanel.java
rename : mobile/android/base/tabspanel/RemoteTabsList.java => mobile/android/base/tabs/RemoteTabsList.java
rename : mobile/android/base/tabspanel/RemoteTabsPanel.java => mobile/android/base/tabs/RemoteTabsPanel.java
rename : mobile/android/base/tabspanel/RemoteTabsSetupPanel.java => mobile/android/base/tabs/RemoteTabsSetupPanel.java
rename : mobile/android/base/tabspanel/RemoteTabsVerificationPanel.java => mobile/android/base/tabs/RemoteTabsVerificationPanel.java
rename : mobile/android/base/tabspanel/TabsPanel.java => mobile/android/base/tabs/TabsPanel.java
rename : mobile/android/base/tabspanel/TabsTray.java => mobile/android/base/tabs/TabsTray.java
Bug 1047971: Delete redundant initialisers-to-default-values from constructors (TwoWayView) r=rnewman
Bug 1048907 - Cast tabs button to ThemedImageButton (r=mcomella)