Maven -> SBT.
Consider <code> tags.  Support more video sites.
Merge upstream changes to branch 'master' of git://github.com/GravityLabs/goose

Conflicts:
	pom.xml
Version bumped to 2.1.22.
Merge remote-tracking branch 'remotes/jaytaylor/master'

Conflicts:
	pom.xml
	project/plugins.sbt
	src/main/scala/com/gravity/goose/extractors/ContentExtractor.scala