remove all uses of ~str
update to last Rust
- ~Str -> StrBuf
update to last Rust
- StrBuf -> String
Update CString to convert to string instead of strbuf
Merge pull request #40 from dguenther/update_string

Update CString to convert to string instead of strbuf
update to last Rust
- Eq / Ord reform
finalize Eq/Ord renaming + hide warning for snake_case lint
fix pong example
- librand -> std::rand