adds filter catch tests
filter iter inherits from std iterator
adds filter iter postfix ++
adds filter iter ==
makes filter iterators assignable
tests 1 argument version of filter
builds filter test
removes trailing filter comment
makes Filter copyable and movable (when it can)

Actually let's the compiler figure it out
tests than filter moves and binds correctly
ignores .swp files
tests filter with solidint
uniform initialization in enumerate *
tests filter when all elements fail