Zend controller test contains

This allow to match a partial query node value content in AbstractHttpControllerTestCase:: assertQueryContentContains, and not only an exact match.
A node with the value "foo, bar, lol" would match "foo", "foo,", "bar, lol", etc...

@blanchonvincent
@nbochenko what's the difference between the test `testAssertQueryContentContainsPartialMatch` and `testAssertQueryContentContainsWithSecondElementPartialMatch`?