updated docblock annotations to match the method's argument list.
removed unchecked return value from method deleteSyncExceptionsForUser().
added proper docblock to method getUsersWithRoleId().
cleaned up method implementation.
updated docblocks of various methods.
tab to blankspace conversion.
post-query cleanup: free result set.
Merge pull request #279 from stopfstedt/master

code cleanup in User class.