added: Ex4 tests
added: Ex5 unit tests
Merge branch 'ex5' of https://github.com/vasnake/coursera-ml005-unittests
Merge branch 'ex4' of https://github.com/vasnake/coursera-ml005-unittests

Conflicts:
	ex4/test_ex4.m
Merge branch 'master' of https://github.com/Troddel/coursera-ml005-unittests

Conflicts:
	ex4/test_ex4.m