Make wsend-gpg far more secure as well as more efficient

The additional parameters add bzip2 compression, use a more secure cipher and digest algorithm, use 65 million rounds of hash (to thwart bruteforce attacks) and require gpg to use secure memory.
Merge pull request #3 from pmarreck/patch-1

Make wsend-gpg far more secure as well as more efficient
This works really well and functions exactly the same for the user. Thanks a lot!