Add twelve-days exercise
Merge pull request #50 from bistik/twelve-days
Port binary search tree to perl
Fix order of arguments for is
Port nucleotide counting to perl5
Fix naming for consistency
Port grade school exercise to perl5
Port gigasecond to perl5
Merge pull request #51 from bentglasstube/master

Port exercises to perl5
Fix parse error in config
Add missing problems to config