Updated Graph structures. Added Graph tests.
Merge branch 'master' of github.com:mascarpato/compiladores
Merge branch 'master' of github.com:mascarpato/compiladores
Merge branch 'master' of github.com:mascarpato/compiladores
Merge branch 'master' of github.com:mascarpato/compiladores
Merge branch 'master' of github.com:mascarpato/compiladores
Merge branch 'master' of github.com:mascarpato/compiladores
Merge branch 'master' of github.com:mascarpato/compiladores
Merge branch 'master' of github.com:mascarpato/compiladores
Merge branch 'master' of github.com:mascarpato/compiladores
Merge branch 'master' of github.com:mascarpato/compiladores