[fix/folders] remove old modx files
[fix/folders] move files back to root
[fix/folders] move files up one level

Root folder now equals the root folder of the extension.
[fix/folders] fix unit tests after moving files
[fix/folders] fix paths for travis builds
Merge pull request #167 from marc1706/fix/folders

[fix/folders] Fix folder structure as mentioned by nickvergessen