Merge pull request #60 from alexcrichton/update

Update to rust master
v0.2.5
Fix for macro syntax change in rust on 2014-12-19

- fix
- version bump
Merge pull request #62 from octplane/fix_rustc_2014_12_19

Fix for macro syntax change in rust on 2014-12-19
Add a Makefile to drive Cargo.
The old url crate is gone, don’t mention it in docs. Fix #63.
Udpate to rust master