kafka-940; Scala match error in javaapi.Implicits; patched by Joel Koshy; reviewed by Jun Rao
kafka-937; ConsumerFetcherThread can deadlock; patched by Jun Rao; reviewed by Joel Koshy
KAFKA-941 Add Apache 2.0 license to missing code source files
merge 0.8.0-beta-candidate1 from apache kafka upstream;