Merge pull request #3 from feigema/master

不好意思完全白用,也稍微做点贡献
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确实有bug，感谢
update

update
builder 1.0.0 alpha

builder 1.0.0 alpha
lib 1.0.0 alpha

lib 1.0.0 alpha
update doc and examples

update doc and examples
update doc

update doc
update doc

update doc
fixed preview bug

fixed preview bug
fixed builder bug

fixed builder bug
update builder

update builder
update how to use

update how to use