trying to solve UDP input rcvbuf error problems

this also has to be done with the syslog UDP inputs if it is working!
Merge branch 'develop' of github.com:Graylog2/graylog2-server into develop
also set ReceiveBufferSize for syslog udp
execute GELFProcessor in thread pool
have one message parser thread pool in graylogserver
increase ring buffer size
Revert "have one message parser thread pool in graylogserver"

This reverts commit 5a850f14136b384b2c8df5a6b8d76f496301d55f.
Revert "execute GELFProcessor in thread pool"

This reverts commit 0413e69bfe7941066dcb6360603f4e27d3c8bb06.
re-implement host counting without syncing
add rules checking to configtest
Merge pull request #82 from bsx/develop

add rules checking to configtest
zomg missing license statement
improve instrumentation
experimental TCP GELF input
use nul byte delimiter, not line delimiter for TCP GELF input
fix naming issues in instrumentation, instrument message input type rates
remove instrumentation for message input type rates. better way to be found
first very simple healthcheck with HTTP API. experimental
working version of first health check
config options for healthcheck http api