v0.48.6.
Added missing SSCAN iterator.
Added example for HSCAN and SSCAN iterators.
Update Syllabus to v0.35.4, fixed SSCAN mix-in.
On branch master
modified:   Readme.md
new file:   example/iterator-hscan-example.js
modified:   example/iterator-scan-example.js
new file:   example/iterator-sscan-example.js
modified:   lib/iterators/scan.js
modified:   package.json
modified:   test/iterator-scan-test.js