Merge pull request #90 from iSpring/develop

merge develop to master

Merge pull request #82 from iSpring/develop

release version 0.5.1

Merge pull request #42 from iSpring/develop

merge develop 0.4.4 to master

Merge pull request #25 from iSpring/develop

merge develop version 0.3.3 to master

Merge pull request #8 from iSpring/develop

Update master

update gulpfile