add UI for changing secret keys

enzevalos_iphone.xcodeproj/project.pbxproj

enzevalos_iphone/Base.lproj/Main.storyboard

enzevalos_iphone/ButtonCell.swift

enzevalos_iphone/ButtonCell.xib

enzevalos_iphone/DataHandler.swift

enzevalos_iphone/KeyCell.swift

enzevalos_iphone/KeyCell.xib

enzevalos_iphone/KeyViewController.swift

enzevalos_iphone/KeyViews.storyboard

enzevalos_iphone/SecretKeyTableViewController.swift

enzevalos_iphone/StyleKits/IconsStyleKit.swift

enzevalos_iphone/StyleKits/LabelStyleKit.swift

enzevalos_iphone/StyleKits/NoSecIconStyleKit.swift

enzevalos_iphone/SwiftPGP.swift

enzevalos_iphone/de.lproj/Localizable.strings

enzevalos_iphone/en.lproj/Localizable.strings