Test question on several line in bob ruby assigment

This commit add a new test to validate that we can't work with a
multiline.

Before this commit you can pass all test with using regexp /\?$/ but if
you use this regexp is not valid you need use /\?\Z/ to force to use
this one.
Merge pull request #611 from shingara/improvement/bob_test_on_multiline

Test question on several line in bob ruby assigment