[Minor] small code cleanup 

added default constructor, instead of instantiating instance variables
at declaration
[Major] Moved property helper methods to PropertiesHelper

Moved the property helper methods from SystemHelper to a new class
PropertiesHelper and added methods where one can pass in the actual
properties thus not being restricted to the system properties
Merge branch 'master' of git@github.com:eitch/ch.eitchnet.utils.git