Reworked KeyList

* Added ic_menu_btn_add from android design icons
* KeyListPublicActivity doesn't use splitActionBarWhenNarrow
* layout/key_list_public_activity.xml  removed TextView with listInformation text
* Reworked KeyListPublicActivity
* Reworked KeyListPublicFragment
* Added menu/key_list_public
Added beautifyFinterprint to PgpKeyHelper
Added KeyDetailsActivity
A:KeyListPublicFragment.onListItemClick()
Added a menu for KeyDetailsActivity

* The menu contains all items from the context menu in the old keys list
* Removed splitActionBarWhenNarrow from KeyList
* Renamed menu_exportKey to menu_exportKeyToFile
Added functionality to Option Menu Items
Moved masterkey table from key_view to master_key_details
Reworked KeyDetailsActivity

* Added MasterKeyFragment
* Master key metadata is now rendered in MasterKeyFragment from db