Merge pull request #222 from LI-HE/master

Color coding issue resolved
Merge pull request #12 from ChrisBoesch/master

update
Merge pull request #223 from ruijunhuang2010/master

Merge pull request #12 from ChrisBoesch/master
challenge creation validation
Merge pull request #224 from ruijunhuang2010/master

challenge creation validation
Merge pull request #5 from ChrisBoesch/master

update