[#62] Added functions for gc content
Merge branch 'master' of github.com:Nozdi/shmir into issue-63-gc-content
[#62] Added tests for functions
Merge branch 'master' of github.com:Nozdi/shmir into issue-63-gc-content
[#62] Fixed import errors
Merge pull request #70 from Nozdi/issue-63-gc-content

[#62] Added functions for gc content