UPDATED: database version

Since the database was updated (user signature was removed) the database version needed to be updated. Also, added a log message to indicated which was the previous version and what is the new version.
ADDED: the crypto library to the libs

Android allows for librarys to automatically be added to the build path if placed in the libs folder. Also, re-added the user key generation since it can now use the library. The reason why it has to be in the libs folder and not added to the build path through eclipse is that the library will not be accessible at run time.