Merge pull request #169 from iain-benson/upstream

Update to use single storyboard and multiple strings files for localisation
Removed get-task-allow from entitlements as it was causing installation failures for non-jailbroken users, added German localisation thanks to @einfallstoll (pull request #168, fixes issue #78).
Enabled code-signing to fix Dropbox SDK support in the jailbroken distribution.
Fixed typos and added missing translations
updated some string for localization
german translation for new strings
english translation for new strings
added myself as a contributor and added twitter for contributors
Merge pull request #174 from einfallstoll/master

More complete localization
Clarified some wording in the English localisation.
Updated Japanese localisation, have yet to tackle the piracy disclaimer.
Updated Spanish localisation with the new lines. Not yet translated.
Accidentally left one line out of the Spanish translation.
Updated French localisation with untranslated lines.
Added untranslated lines to Traditional Chinese localisation.
Added untranslated lines to Simplified Chinese localisation.
Updated the piracy disclaimer.
Translated the piracy disclaimer to Japanese.
Updated Japanese piracy disclaimer translation again.
Adds in-app downloader, to be implemented later