Change Scala license to unmodified 3-clause BSD.

No longer using the slightly reworded 3-clause BSD license.
This does not change the meaning of the license,
just aligns it with the standard wording.
    
Added line for Typesafe's copyright, starting in 2011.
Add redirect for license url in Scala maven poms

All maven metadata for Scala points to
http://www.scala-lang.org/downloads/license.html,
so we should redirect that to license.html.
Merge pull request #112 from adriaanm/master

Change Scala license to unmodified 3-clause BSD.