sbt: upgrade to Scala 2.10.2
docs: replace all links to github master branch to release/1.1 branch
site: update 1.2 docs image
site: update 1.0 docs image
Prepare for 1.1-M8 release
docs: add "spray-M8-released" blog post, smaller improvements
site: small fix for blog URIs
sbt: bump version to 1.1-SNAPSHOT