Added Transform stream implementation for Partial Range Permutation
and Sequences.
Some fixes..
On branch master
new file:   example/partperm-filter-stream-example.js
renamed:    example/brando-stream-example.js -> example/seq-filter-stream-example.js
modified:   example/test-data.txt
modified:   lib/filters/emitters/fullperm.js
modified:   lib/filters/emitters/partperm.js
modified:   lib/filters/streams/fullperm-transform.js
modified:   lib/filters/streams/partperm-transform.js
modified:   lib/filters/streams/sequence-transform.js