extended admin rescan to show what repositories was added and what removed fixed found bugs, added expunge to cached getter since it introduce some more problems. Added some relationship to properly clean related objects from database.

syntax: glob
*.pyc
*.swp

syntax: regexp
^build
^docs/build/
^docs/_build/
^data$
^\.settings$
^\.project$
^\.pydevproject$
^rhodecode\.db$
^test\.db$
^repositories\.config$
^RhodeCode\.egg-info$