CDX Server: Add HowManyController to wayback-cdx-server.
Add plain count output for HowMany tool.
Add ia-web-archive-cdx-server-config which is the config for the web.archive.org/cdx server
Add support for last N results by setting limit=-N
Add fastLatest=true query for return some number of latest results (from last block in ZipNumCluster)
Update README
Merge branch 'master' of github.com:internetarchive/wayback