Bug 869123: Make a re-useable MenuItemDefault. [r=wesj]

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extra : rebase_source : f5572d35a8f7d954987c152304a460a03142fee9
Bug 869123: Make a "menu" package for menu related stuff. [r=wesj]

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rename : mobile/android/base/GeckoMenu.java => mobile/android/base/menu/GeckoMenu.java
rename : mobile/android/base/GeckoMenuInflater.java => mobile/android/base/menu/GeckoMenuInflater.java
rename : mobile/android/base/GeckoMenuItem.java => mobile/android/base/menu/GeckoMenuItem.java
rename : mobile/android/base/GeckoSubMenu.java => mobile/android/base/menu/GeckoSubMenu.java
rename : mobile/android/base/MenuItemActionBar.java => mobile/android/base/menu/MenuItemActionBar.java
rename : mobile/android/base/MenuItemDefault.java => mobile/android/base/menu/MenuItemDefault.java
rename : mobile/android/base/MenuPanel.java => mobile/android/base/menu/MenuPanel.java
rename : mobile/android/base/MenuPopup.java => mobile/android/base/menu/MenuPopup.java
rename : mobile/android/base/Divider.java => mobile/android/base/widget/Divider.java
rename : mobile/android/base/GeckoPopupMenu.java => mobile/android/base/widget/GeckoPopupMenu.java
extra : rebase_source : 3b51b8af8318e346fe41b3ab7c18421d67b1359b