remove deprecated crate definitions
string indexing no longer allowed in rust
Merge pull request #1 from kagia/rust0.11

Fixes for rust nightly
initial Cargo integration
Merge remote-tracking branch 'upstream/rust0.11' into rust0.11
Merge pull request #2 from kagia/rust0.11

Cargo integration
Updated 0.11 compatibility. See long commit message for details.

* Updated to_str to to_string where necessary
* changed args.get(0) to args[0] as the former is deprecated
* changed to_owned to to_vec as the former is deprecated

All tests pass.
Add first version of travis.yml
Merge branch 'master' into rust0.12
Add vagga file
Fix lifetimes for rust0.12
Fix tests for current rust nightly
Fix deprecation warnings under Rust v0.13