Don't bother implementing make-prime-list
add sum
Merge pull request #191 from beatgammit/master

add sum
id: remove deprecation warning
Merge pull request #192 from Arcterus/master

id: remove deprecation warning
to_{strbuf,owned} -> to_string
update rust-crypto
Merge pull request #193 from ebfe/fix-build-master

Fix build with rust master
Improve cat performance
fix small bug
more bugs
some more optimizations
fix some wrong command line arguments
fix bug
make write() safe
add interactive mode
improve interactive mode