Add more base style
Add more ui for module btn

1. .ui-sketch
2. .ui-square
3. .ui-pill
Update variable name
Add module caret
Add module circle
Update toc
Fixed caret position bug

Describe:

.amid-180 & .amid-360 can not horizontal center.

Reslove:

set default left: 0; in amid.styl
Update demo html
Add half state
Remove position modifiers for module caret