Aula 2013-03-20 - Uri hierarchy using inheritance support in Java

This is the code as it was at the end of the class. It does support fully the Http and Ftp schemas and no parse for mailto and geo.

The problem of Uri creation is not yet solved.

This code does not compile, because tests were not changed to support the refactoring done!
Merge branch 'master' of https://github.com/lfalcao-isel/POO-LI21D-LI23D-1213v

Conflicts:
	Aulas/2013-03-20/src/poo/uri/Uri.java
	Aulas/2013-03-20/src/poo/uri/UriFtp.java
	Aulas/2013-03-20/src/poo/uri/UriHttp.java