replaced system() calls with FileUtils.* method
This also makes that 'mv: cannot stat `/ho..' is not shown in the test :)

consistent spacing

require fileutils

Revert "require fileutils"

This reverts commit 54313d3bbaa60cfc5b405be50cc00b7f6b0cb715.

new hash notation

FileUtils.mv in begin/rescue block
Merge pull request #2207 from koenpunt/system-to-fileutils

replaced system() calls with FileUtils.* methods