Revert "added rake as development_dependency"

This reverts commit 328b4ef415588c9d5a9762ae972ca5129488d075.
Revert "added rakefile"

This reverts commit 3318b71a9f60197cbf0c7f8e41fbd8b3bff9aa8e.
Revert "added .travis.yml"

This reverts commit 50f3d497b881cc00ef82864b31ffb04b284237d3.