Css Spinner Versions Save

• replace colors with @plotdb/color
• upgrade some devDependencies

• fix blinking issue of ripple spinner in mobile Safari

• add missing vars.styl and ensure build pass
• fix typo in spinner about color ( incorrectly set to vendors, which should be color.fg )
• fix incorrect paths in mixin.pug

• rename css-spinner to @loadingio/css-spinner since the old name conflicts.
• correct box-sizing model in every spinner
• fix ripple and heart spinner alignment
• add mixin.pug
• use currentColor for spinner color
• add style field in package.json
• support attributes in mixin

First version.