Update README.md to fix link to rust website

the rust-lang.org site requires www and doesn't redirect.
Merge pull request #373 from ebfe/fix-deprecation

Fix deprecation warnings
Get rid of unsafe indexing

Unsafe indexing is replaced by ImmutableEqVector::position_elem() and a
few branches have been eliminated.

The performance is about the same as for unsafe indexing.
Merge pull request #375 from polyphemus/cut-bytes-iterator

cut - get rid of unsafe indexing
common/util: make pipe_writeln! use writeln! instead of write!
Merge pull request #377 from Arcterus/fix-pipe_writeln

common/util: make pipe_writeln! use writeln! instead of write!
Replace deprecated from_c_str with from_buf in id
Merge pull request #379 from IvanUkhov/from-buf

Replace deprecated from_c_str with from_buf in id
update rust-crypto
Fix build with rust master
Merge pull request #382 from ebfe/fix-build-master

Fix build with rust master
Fix sync and whoami on windows.
Merge pull request #380 from xmasotto/master

Fix sync and whoami on windows.
Add repr(C) to c structs
Update for new import syntax
Merge pull request #383 from ebfe/import_as

Update to new import syntax
Merge pull request #384 from ebfe/repr_c

Add repr(C) to c structs
Update rust-crypto
time::Duration::{milli}seconds now takes i64 arg
Add explicit lifetimes