Merge pull request #87 from ChrisBoesch/master

Updates
Merge pull request #88 from ChrisBoesch/master

Updates
Merge pull request #89 from ChrisBoesch/master

Updates
Merge pull request #272 from LI-HE/master

solved nav bar links faulty accross all play pages
Merge pull request #90 from ChrisBoesch/master

Updates
minor amendment on tab color
Merge pull request #273 from ShaikDawood/master

minor update on tab color
Update Badges Alignment
Merge pull request #274 from ShaikDawood/master

Update Badges Alignment
Merge pull request #91 from ChrisBoesch/master

updates
Merge pull request #32 from ChrisBoesch/master

update
modify challenge country selection
Update Badges Alignment#2
Merge pull request #275 from ShaikDawood/master

Update Badges Alignment#2
Merge pull request #276 from ruijunhuang2010/master

update
Merge pull request #92 from ChrisBoesch/master

Updates
Merge pull request #33 from ChrisBoesch/master

update
Challenge Bug fixed#3

challenge.html: Display the secret msg once user unlocks the challenge.
Merge pull request #277 from ShaikDawood/master

Challenge Bug fixed#3
Merge pull request #93 from ChrisBoesch/master

Updates