Bundle the scala-library together with the plug-in

Instead of requiring the scala library to be available to install the
plug-in, it is much better to package it together with the plugin.

The rational is that this template is used for creating an Eclipse
plug-in that can be developed using Scala, and there should be no
requirement of having the Scala IDE installed.

Updated README

Removed junit dependency

Also removed the scala-library dependency from the test bundle, as it
is inherited from the plugin MANIFEST.
Removed the appending of the git hash to the plug-in version

Let's just keep things simple