Merge pull request iSpring#90 from iSpring/develop

merge develop to master

Merge pull request iSpring#82 from iSpring/develop

release version 0.5.1

Merge pull request iSpring#42 from iSpring/develop

merge develop 0.4.4 to master

Merge pull request iSpring#25 from iSpring/develop

merge develop version 0.3.3 to master

Merge pull request iSpring#8 from iSpring/develop

Update master

update gulpfile