disable gem install debugger for ruby version >= 2
Merge remote-tracking branch 'wagn/develop' into develop

Conflicts:
	Gemfile
1. add checking to length of card name
2. add test case
Merge remote-tracking branch 'wagn/develop' into develop
1. remove name checking in controller and the related rspec case
2. add checking in name.rb's event and the related rspec case
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Merge remote-tracking branch 'henry/develop' into henrydev
minor tweaks to name validation