update changelog
Merge pull request #16 from ecomfe/1.1.0

1.1.0
Update package.json

Fix `devDependencies`
add flex support and fix some opera prefix
add box-align
update changelog
Merge pull request #17 from ecomfe/1.2.0

1.2.0
Update less deps
Update less deps
Fixed #18
v1.2.1
Merge branch 'master' of https://github.com/ecomfe/est
update changelog
Merge branch 'master' into gh-pages