add happy numbers
Merge pull request #38 from jschaf/happy-numbers

add happy numbers
Fixed check_file.rs

The previous implementation did not print anything, because it used a map without iterating through it.
Added link to rosettacode.org in rot13.rs
Added link to rosettacode.org in mutual_recursion.rs
Merge pull request #40 from aochagavia/pr-4

Fixed check_file.rs and added some links to rosettacode.org
Simplified swap.rs
Merge pull request #39 from aochagavia/pr-3

Simplified swap.rs
Use unwrap instead of ok
Added Set
Merge pull request #42 from aochagavia/set

Added Set
Fixed comments on set.rs
Add Gitter chat link.

Might as well try it!
Fixed almost_prime.rs
Fixed anagrams.rs
Fixed averages_mean_angle.rs
Added 'implements [link]' to all files
Merge pull request #43 from aochagavia/comments

Added 'implements [link]' to all files
Added implementation of Stack
Fixed LZW compression