Revert "Use 1.8 require_relative elsewhere too"

This reverts commit fc10a1dc0f1e1c943734518004aee96ec25ab316.
Revert "Fix tests on 1.8"

This reverts commit 465e36ef5344e233c7299275f467669d8f33178d.
Revert "require relative in order to run test with ruby instead of rake"

This reverts commit 39a0702fb565250aea15c818eb3a5ba6b9148f38.