just mv

* tests/unit/src -> tests/src
* tests/unit/bootstrap.php -> tests/bootstrap.php
replaced namespaces

* `find tests -type f -exec sed -i 's/Unit\\//g' '{}' \;`
* `find tests -type f -exec sed -i 's/\\Unit;/;/g' '{}' \;`
Merge pull request #16 from tamakiii/hotfix/15_remove_unit_dir

Hotfix/15 remove unit dir