Added removeElem to Coproduct
Merge pull request #193 from stacycurl/coproduct-remove-elem

Added removeElem to Coproduct
Added Lens/Prism unapply.
Use canonical references to Sonatype repos. Added releases to work around central issues.
Removed sbt-eclipse.
Tidied .gitignore.
Merge branch 'master' into scala-2.10.x

Conflicts:
	project/Build.scala