Merge pull request #2 from dnet/master

improvements, fixes, test suite
[mod] removed iso8601 as a dependency
[doc] documented fileformats briefly
[doc] updated fileformats
[doc] updated fileformats
[enh] encrypted pfs keys. also added a 4th key
[doc] updated fileformats.txt
[mod] removed iso8601 as dep
[enh] added exit in case test.sh fails
[enh] [de|en]crypt_handler now independent of arg parse
[enh] decoupled the other _handlers from argparsing + added more outfile handling
[mod] added authors file
[fix] pfs mode
[fix] bughunting and outfile handling
[fix] more stdout bughunting
[enh] improved pfs tests
[enh] stdout if no output  file given
[enh] test for keylist length for pubkeys as well
[enh] moved fileops outside 'if' in encrypt_handler