Set up in Netbeans
Created rough draft of the IP superclass
Fixed visibility of _type to allow extending IP
Made IP friends with IPv4, added default value for _type and fixed the assignment operator
	it now takes a *const IP&* instead of a normal *IP&* and the implementation in the base class *IP* got removed
Added some docs
Implemented IPv4
Added comparison operator *operator ==*
Added missing return statements to the operator functions
Started to implement IPv6
Need to learn how it works first though...