Update README.md to fix link to rust website

the rust-lang.org site requires www and doesn't redirect.
sync for Windows implementation
Crate name fixed
Program name fixed
Fix for hashsum: fix file checking #305

* Changed line verifications to use regular expressions.
* Added binary marker to output and start using the marker from
    the check file line as input to calc_sum
* Convert characters to lowercase before comparison in check

Gil Cottle <gcottle@redtown.org>
fix comment
Fix typo and code formatting
Merge pull request #306 from redcape/regex-hashsum-check2

Fix for hashsum: fix file checking #305
Merge pull request #307 from ebfe/cargo

add Cargo.toml
Add type suffixes where necessary
std::bool::to_bit was removed
Merge pull request #308 from ebfe/fix-build-master

Fix build with rust master
drop stty

Get rid of the in progress for stty.
Merge pull request #310 from alan-andrade/patch-6

drop stty
 use latest rust-crypto for new rust master
Merge pull request #312 from redcape/update-rust-crypto

 use latest rust-crypto for new rust master
Merge pull request #285 from xanderfomin/sync

sync for Windows implementation
move sync to PROGS
Merge pull request #313 from Heather/master

move sync to PROGS
nohup implementation