Added iterator version of into_vector
Makes filtering compatible with wrapped reduction type.
Added basic perf test.
Added a transducer for inserting a value after each input.
Merge branch 'master' into perf_tests
Added 'idiomatic' algorithms implementation to perf_test
Added transducer which emits a value at beginning of processing.
Merge branch 'master' into perf_tests
Moved perf_test definition to its own file.