Add NaN handling config options
input/collectd: Implement handling of NaN values
Add tests for the collectd NaN handeling
input/collectd: Better tagging on NaN

  * Don't overwrite existing tags
  * Allow the user to config the tag to add when a NaN is found
touch up statsd output
explain defaults
touch up
touch up email doc
put the pencil to graphite
minor updates, submitting two PRs as one
correct email config hash options
geoip touchup
For you Graylog2 fans out there
Repeat after me: Logstash is a proper noun.
gelfin
additional fields, underscores
escape underscores
elasticsearch input
alert: nagios
Add elasticsearch rubygem

This is used in the new http support of elasticsearch output.