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Merge pull request #7 from umegaya/umegaya/hotfix/0.2.0

Umegaya/hotfix/0.2.0 travis build passes.
prepare for release 0.2.0-3
Merge pull request #9 from umegaya/umegaya/hotfix/0.2.0-2

fix problem that if no copt specified, csrc not works 
travis test passed
fix bug that C string concat is not processed correctly
fix bug that cannot parse string literal which contains escaped " correctly