Fix issue with $uptime being undefined

Fix issue with $uptime being undefined.
On my setup perl requires a variable to assign the return value of the split operation. Without this the value of $uptime ends up being undefined.
Merge pull request #504 from stephankn/patch-1

Fix issue with $uptime being undefined
Convert perl script to bash

For a better compatibility
First version of the Munin plugin to monitor HHVM
Update powered_up_

add optional use of "/dev/disk/by-id"
Support some more jenkins statuses: notbuilt_anime, aborted, aborted_anime
Removed load warning level
Added Apache 2.4 config example
Fixed multigraph for monitoring multple HHVM instances
Merge pull request #510 from columbusmonkey/master

Support some more jenkins statuses: notbuilt_anime, aborted, aborted_ani...
Merge pull request #509 from lr1980/patch-1

Update powered_up_
Merge pull request #508 from jeroenvermeulen/hhvm_plugin

First version of the Munin plugin to monitor HHVM
Merge pull request #507 from googley/master

Convert perl script to bash
proftpd: converting to /bin/sh

Some cleanup
Merge branch 'master' of https://github.com/munin-monitoring/contrib