Fix percentiles on metrics filter
Added option to disable certificate validation

If a IMAP-server is using a self-signed certificate, this patch adds a "verify_cert" option to the module that is by default set to true (old behavior), but if set to false it will disable the verification check. The result is that IMAP TLS with self-signed certificate will not crash logstash.
Added option to disable certificate validation
New collectd codec to go with the new and improved multithreaded udp input plugin.  This makes the collectd input plugin obsolete.

# The Logstash input configuration can be as simple as:

```
input {
  udp {
    port => 28526
    buffer_size => 1452
    codec => collectd { }
  }
}
```
Figured out why `@types` wasn't initializing before register.  It needed to be above `super` (thanks @jordansissel)
Add tests for the collectd codec
Merge pull request #1 from pieterlexis/collectd-untergeek

Add tests for the collectd codec
Added warning when registering insecure state
Change [A|a] by [Aa], etc.
bluecloth is needed to build the docs
json_lines codec documentation is special since it isn't used with the file input.
Also fixed formatting issues with the config examples in the synopsis section.
Remove unused docs
Use 'make package' for building rpms/debs for contrib
Dont need 'build time' in the iteration
Release/upgrade notes for 1.4.0
Add link to release notes and changelog
Version bump
Version bump
Add s3 upload
Merge branch '1.4.x' of github.com:elasticsearch/logstash into 1.4.x