Original code by Maarten

source: http://www.gmot.nl/index.php?topic=26371.msg805848#msg805848
Code consistency
Enforcing PHP >= 5.4
Reverting varDiff to vardiff

Using CamelCase makes more sense indeed
Added a warning to prevent running in devmode
Merge pull request #2 from JochemKuijpers/bandwidthmerge

Merge to master
Moved configuration to a separate file

Configuration settings are now defined as constants and in a separate
file so developers can set up their own configurations more easily.
Unnecessary tabs
Re-added devmode warning
Devmode warning spacing
Devmode warning spacing
Merge pull request #11 from JochemKuijpers/master

Bandwidth instead of Download/Upload