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
Try more times to fetch from rubygems.org

Of the last 14 build failures, 6 of them were because of bad_record_mac.
Hopefully retrying more will work around this.
fix handling of more than 2 repetitions of same mail header
Update changelog for 1.4.0 RC1
Update version
Skip file input test; I don't think it's expected to work right now
bundler updated the MRI 1.9.1 lockfile
actually build rpm/debs
shift specs selection from Makefile to leverage rspecs tags
fix timing issue and cleaups
tag :performance for exclusion
tag :redis for exclusion
tag :elasticsearch for exclusion
tag :broken for exclusion