set an individual number of maximum hostnames per user
Merge branch '0.2-dev' into userlimits

Conflicts:
	ddserver/interface/pages/user/hosts.py
	ddserver/resources/doc/schema.sql
	ddserver/resources/templates/addhost.html
	ddserver/resources/templates/index.html
	ddserver/resources/templates/users.html
added add-user function for admin