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yield block on ActiveGroonga::Base.new
Merge pull request #11 from eitoball/yield_block_on_active_groonga_base_new

Yield block on ActiveGroonga::Base.new

Patch by Eito Katagiri. Thanks!!!
Fix style

Add missing parenthesis for yield.
test: test only new with block

Testing save is not this test scope.
Use " (double quote) for string literal