Upgrading to sbt 0.13.2-M2.
Allowing to add attributes using Pair[Symbol, String] or Pair[String, String]

- Syntax like P('name -> "para", "id" -> "para1", 'dataToggle -> "dropdown")
will transform in to <p name="para" id="para1" data-toggle="dropdown/>
(Notice the camelcase-style to dash-style transformation when using symbols)
Allow to combine multiple Class and Rel attributes using &.
Adding For, Placeholder and OnSubmit attributes. Adding (more) values for Name, Type, Rel and Charset.
Allow to specify LineHight with a 9.px 2.em etc.
Providing values for Border CSS.
Use vals instead of objects for CSS-values.
Updating imports.