Version 0.19.0

Check out this post for more details.

• No longer use iframe to contain editor
• Quill containers' class names changed to prefix ql-
• Some module containers' classnames shortened ex. ql-toolbar-container is now ql-toolbar
• Quill.prototype.addStyles removed
• Allow false value to styles config to disable adding styles
• Renamed default theme to base
• Npm name changed to quill
• Added style guide
• Resolve issues #149, #179, #183, #221, #232, #235, #236, #242, #246
• Merge PR #243

Thank you @paulchaplin @leoasis @benbro @lewisvance @kevinmartin @sferoze @brettPeriscopic for their issue reports. Thank you @thomsbg for his PR and @leoasis for his work on an iframe config PR.