Bumping version to rc.1
Prepare next development cycle: 0.21.0-rc2-SNAPSHOT
Remove obsolete local copy of syslog4j
Increase default output_batch_size to 1000, fixes #705
Update documentation links to point to the new graylog2.org page.
Revert "Increase default output_batch_size to 1000"

This reverts commit 574a2e4f78aea6bc9f0e1673e005acb26697eb76 until the problems
described in #705 have been investigated.
Add config parameters to configure Netty HttpRequestDecoder, fixes #707
Clean up org.graylog2.plugin.Message
Handle edge case in RegexExtractor, fixes #708
Merge branch '0.21' into perfFixes