Switched solution to n-queens.
fix concurrent_computing
fix happy_numbers
add attributes to fix dead_code and unused_imports
Merge pull request #53 from reem/nqueens-update

Switched solution to n-queens.
Fixed outdated link to source file
Merge pull request #55 from jschaf/fix-happy

fix happy_numbers
Merge pull request #54 from jschaf/fix-concurrent

fix concurrent_computing
Merge pull request #56 from jschaf/fix-dead-code

add attributes to fix dead_code and unused_imports