Use Query.visible scope.
Removed unnecessary calculations in time entries index.
Adds named scopes for time entries index.
Merged r8002 from trunk
Bulgarian translation updated by Ivan Cenov.
Adds named scopes for projects index.
Adds named scopes for users index.
Adjusts images position in filters.
Progress bar style.
Moves test to non-transactional fixtures tests (failure with postgresql).
Fixes spent time column sort for postgresql.
