ntp_: rewrite plugin to support IPv6

Closes Debian bug #558800 and Munin trac ticket #775
Create directory with OpenBSD-compatible plugins.
Merge pull request #62 from yason/devel

OpenBSD-compatible plugins.
master/html: implement lazy loading for images

It is done using the lazyload library

(http://www.appelsiini.net/projects/lazyload)
html: Add a "loading circle" on lazyload
Reduce logging at INFO level in munin-graph

Improves Trac ticket #1251.  Reduces normal log lines by 66%.
hp2000_: New aspect for port based metrics.
Merge branch 'lazyload' into devel
Merge pull request #58 from kenyon/ntp-rewrite2

ntp_: rewrite plugin to support IPv6
tests: fix RRDs deps in unit testing

RRDs.pm does exist in travis. We do not really use it anyway.
tests: fix warning about potential typo
tests: Net::Server dep was missing in .travis.yml
tests: Module::Build is duplicated in .travis.yml
tests: rm the OS::get_fq_hostname() test for "."

The Travis-CI VM do not have any "." in their FQDN.
Merge pull request #67 from steveschnepp/fix-travis

Fix travis builds
tests: Use only IRC notifications for TravisCI
Merge branch 'travis-notify' into devel
iostat and irqstats include/exclude list

- include_only config option for iostat
  one can set a list of devices which will be monitored

- skipdevs option for irqstats
  specified devices will be skip from monitoring
  it's very handy on citrix xenservers with many VMs
common: win32 ignore getpwuid, getgrgid, getpwuid

On win32, just ignore the syscall that are Unix perms related.
tests: use Cwd module instead of PWD

Win32 doesnt know about PWD, but Perl already abstracted it away in
Cmd.