Osc-tiny

Added the `expand` parameter to some methods of the `packages` extension.

* Added :py:mod:`osctiny.extensions.origin`
* Added :py:mod:`osctiny.utils.mapping`
* Removed support for all Python version prior to 3.6

Changed `osctiny.extensions.packages.Package.aggregate` to always enable the build flag

* Added `osctiny.extensions.buildresults.Build.get_binary`
* Added `osctiny.extensions.buildresults.Build.get_package_list`
* Changed `osctiny.osc.Osc.get_objectified_xml` to accept request objects and strings