Refactor to make the Travis log more readable.

[junaruga]

I am debuging seeing the Travis log now.

I have 2 suggestions to improve the Travis log's readability.

• Split the script command.
• Add a mark for each test to find it easily.

1st commit is inspired from https://github.com/travis-ci/travis-ci/issues/1066#issuecomment-32415710 . This makes us to find the make simple-test easily in the log. You can see this Travis log.

2nd commit is to add a mark to each test case header. It's like this. For people who will debug bowite2, current testing log is hard to find the target test when seeing the error.