Snapcraft 2.8

Hello snapcrafters!

We are pleased to announce the release of version 2.8 of snapcraft: https://launchpad.net/snapcraft/+milestone/2.8
Among the many house keeping activities in preparation for Xenial's release we worked on these bits of interest:

- Better detection for dirty steps which would need to rerun to reflect the current snapraft.yaml
- More similarities to debuild. By default now, apt sources reflect those of the desktop. For ensuring a clean build you can use cleanbuild.
- Among popular request, geoip is disabled by default and enabled by setting --enable-geoip
- Work on supporting the new interfaces from snappy (ongoing work). This change should still work with the old-security interface if still required (keep in mind it won't be there for 16.04).
- As mentioned by the snappy core team, `config` is gone, hence support for it removed from snapcraft as well.

For plugin developers, system-related properties have been removed from `snapcraft.common` and are now available via the `project` attribute.

To consume the latest snapcraft release on Xenial Xerus (16.04), we suggest you install the snapcraft package from the Ubuntu Archives:

    sudo apt update
    sudo apt install snapcraft

If you don't want to use the examples from the source branch you can also install the examples package:

    sudo apt install snapcraft-examples

After installing this you can find them in /usr/share/doc/snapcraft-examples/examples.

To get the source for this release check it out at https://github.com/ubuntu-core/snapcraft/releases/tag/2.8

A great place to collaborate and discuss features, bugs and ideas on snapcraft is snappy-app-devel mailing list or directly in the #snappy channel on irc.freenode.net.

To file bugs, please go to https://bugs.launchpad.net/snapcraft/+filebug.

Happy snapcrafting,
- Sergio and the team