Use -qq flag on apt-get to quiet installations of packages
Silence curl stderr progress output
Ensure curl is installed before using command
Fix issue where certain hosts will not have add-apt-repository installed due to missing packages
Simplify the vagrant workflow

- Moved from wget to cloning the repository
- Add acl-add command to Make
- Modify the docs to use the new methodology
Add a passthru make target for running dokku commands within the vagrant vm