Update repo for rust 0.11-pre

Libc moved to its own crate, arrays indexed with uint's instead of i8.
Check file write result (removes compiler warning)
Add simple webserver example (uses std::io::net)
Convert filenames to relative file links (Github)
Fix file links again (remove quote marks)
Add letter frequency solution

The program letter_frequency counts occurences of each letter in some
file. It uses collections::HashMap for gathering statistics.
Add writing to standard error stream example
Add integer sort solution
Add binary dir to .gitignore file
Merge pull request #34 from JIghtuse/to_hoverbear

Sync with my repo