Check for Rake::Task before loading rake tasks

Because if `Rake` exists and `Rake::Task` not loading of `docker/rake_task` crashes.
Pass credentials in Docker::Image.build_from_dir
Merge pull request #131 from mikz/patch-1

Check for Rake::Task before loading rake tasks
bump patch version for new release
Increase ABC complexity
Fix cane violations
Reorder build_from_dir parameters to maintain compatibility
Merge pull request #134 from ahazem/pass-credentials-build-from-dir

Allow passing credentials in Docker::Image.build_from_dir
update excon dep to >= 0.34.0
Merge pull request #138 from swipely/update_excon

update excon dep to >= 0.34.0
Support attaching to STDIN of containers