add param align
update tooltip align logic
make tip container position correctly
make tip container position correctly
modify arrow position
提高tooltip稳定性
update doc
Merge pull request #12 from sdc-alibaba/tooltip

Tooltiptip元素定位布局方式扩充，实现左右对齐.稳定性提高
Merge branch 'dev' of github.com:sdc-alibaba/sui into dev
Merge branch 'dev' of https://github.com/sdc-alibaba/sui into dev
update ac doc
update ac docs
Merge remote-tracking branch 'sui/dev' into dev
Merge branch 'dev' of github.com:sdc-alibaba/qnui into dev
Merge branch 'dev' into build
build