Reorganize code a little in IScala class
Add convenience helpers for display types
Initialize 'previously' properly
Degrade Math from top-level display to a Latex helper
Move Repr and (DisplayUtil -> Repr) to Repr.scala
Generate 'kernel' development command
First compute delta, then eventually cancel computation
Add support for IFrame and YouTube/Vimeo videos
Add LaTeX case class to generate Latex representation
More generic implementation of DisplayObject implicits
Move display framework to display namespace
Move DisplayObjects to Objects.scala
Add auxiliary apply[T,U:HTML](fn: T => U) to HTML

This allows to write:

implicit val htmlX = HTML[X, xml.NodeSeq](_.toNodeSeq)

instead of:

implicit val htmlX = HTML[X] { obj =>
    implicitly[HTML[xml.NodeSeq]].stringify(obj.toNodeSeq)
}
Add ImageURL display object
Add examples/Display.ipynb showing off new display framework

Start notebook with the following command line argument:

-m com.scalatags::scalatags:0.4.1,io.continuum.bokeh::bokeh:0.2-SNAPSHOT