Add argument parser and clean-up in ar-dev
Added .DS_Store to gitignore
Adjusted ar-dev, ar-mac, auth-as, auth-by, ip-mac and role; added debug output to ParserUtil
Event: add argument parser with additional arguments
Event: replace exception message with printStackTrace()
ReqInv: improve argument parsing and delete filter
Deleted ip-disc-by and mac-disc-by, created new tool disc-by.
Added tool for device-charateristic
Adjusted ar-dev, ar-ip, ar-mac, auth-as, auth-by, capability, dev-attr, dev-ip, event, ip-mac, layer2-information and role
Added target to main gitignore
Adjusted search and subscribe tool
Adjusted purge tool
Adjusted performance tool
Adjusted featureSingle tool
Added .metadata folder to gitignore
CLI tools now inherit from abstract super class AbstractClient; adjusted all clients to use new super class; removed some (helper) classes in common-module
Moved parser construction calls from all tools to ParserUtil; fixed null pointer when using optional parameters in Layer2Info
version: add ifmapcli version to module description
Added DHCP server name to ip-mac-tool.
Added missing debug output to ip-mac-tool.