Fixes #145 - Added AuthSourceInternal

Added a password setting facility to the user class for AuthSourceInternal
Switched to SHA1
Changed :ldap to :login
Applied numerous fixes from Ohad Levy
Fixed malformed user page
Switched attr_accessible to attr_protected...

Fixes #260 - Switch to using STI for OS families

Fixes #261 - parameters now use a single reference_id

This implementation uses STI but the table looks the same for all
variants. This is a little strange but it seems to work.

Also removed obsolete controllers and tests
Added more tests

fixes #297 - Prevent operatingsystem.minor from storing NULLs

fixes #290 - migration will fail if facter domain returns on value

fixes #280 - sample data should include newer operating systems

migration might fail if medium does not have an opeartingsystem - refs #236

Fixes #266 - Migrate the (NFS-) paths of existing Installation Media to URI format.

fixes #236 - Installation media are now usable with more than one operating system.

Fixes #265 - improved preseed template and more complicated partitioning scheme for Debian-based distributions.