Added WebJar extraction tasks
Merge pull request #1 from typesafehub/webjar-extract

Added WebJar extraction tasks
Added scripted tests for extracting webjars
Merge pull request #2 from typesafehub/extract-web-jars-test

Added scripted tests for extracting webjars
Removed implicit timeout for actors from sbt-web - caused a great deal of confusion when tracking down a problem. The call-site should be declaring the timeout given that it is in the best position to do so.
Add API for incremental compilation