AskUbuntu tag changes

[Daniel Holbach]

Hello everybody,

after some discussion on meta.askubuntu.com Marco and Jorge helped
implement the following changes http://meta.askubuntu.com/a/15740/94326


 - Rename snap-package to snap, easy to remember and covers everything
   from the snaps themselves to snapcraft, this allows the core team to
   subscribe to just one tag so they can answer questions.
 - Alias snapcraft to snap.
 - Leave snappy aliased to ubuntu-core, which is a pure snappy system.

This means you now have only two tags to monitor: snap and ubuntu-core. :-)

Have a great day,
 Daniel