Problem: license.xml is not in obvious place

Solution: move to root directory (also regenerate make files via
zproject).
Problem: need dummy server actions

Solution: return dummy tags and post content so client can walk
through its protocol.

Note I simplified the message formats so content and tags are just
short text strings. This is easier to work with for now.
Merge pull request #17 from hintjens/master

Implemented dummy server actions