Bugfix: Inside the ConfigReader keys were added to the properties map by using the this pointer. That leads to some weird behaviour when copying the ConfigReader object. Solution: Don't use the this pointer on private member variables if not necessary.

IOUtils.h: getValueForKey now internally uses find when searching the map<string,string>, it used to do a cast, not being able to distinguish between a key with no value and a non-existent key. Now a key value pair like this is allowed:
TEST = 

i.e. an empty value.