Merge pull request #218 from emdete/master

add "never" for ttl for passphrase cache
Fix language problems (thanks to yahoe.001)
Merge branch 'master' of github.com:dschuermann/openpgp-keychain
remove shadow from icon
smaller expiry buttons
remove navigation drawer from help
fix crash on keys with empty user id
Disable getEmbeddedSignatures() until patch by Ashh87 has been applied again in our spongy castle fork
Add spongy castle sources to libraries folder
New build files for spongy castle
Remove old spongy castle libs
New Gradle project structure
Add info about Android Studio to README
Spongy Castle info to README
New gradle folder structure for API Demo
New gradle folder structure for API Demo
New gradle folder structure for API Demo
build process for API DEmo in README
Info about installing apk
re-enable getEmbeddedSignatures