Merge pull request #9 from ChrisBoesch/master

update
Merge pull request #217 from LI-HE/master

removed filtering of display since use info tab now
Merge pull request #218 from ruijunhuang2010/master

Merge pull request #9 from ChrisBoesch/master
Merge pull request #10 from ChrisBoesch/master

update
Merge pull request #219 from ruijunhuang2010/master

Merge pull request #10 from ChrisBoesch/master
Merge pull request #11 from ChrisBoesch/master

Merge pull request #219 from ruijunhuang2010/master
Merge pull request #220 from ruijunhuang2010/master

Merge pull request #11 from ChrisBoesch/master
country default selection for challenge creation
Merge pull request #221 from ruijunhuang2010/master

country default selection for challenge creation
Merge pull request #4 from ChrisBoesch/master

update