update changelog

Merge branch 'master' of https://github.com/NUKnightLab/StoryMapJS

Merge pull request #357 from NUKnightLab/youTubeFix

Unobscure youTube button #351

Merge pull request #339 from NUKnightLab/fr_swipe

translates swipe to navigate for French

Merge pull request #333 from NUKnightLab/zoomify_analytics

Zoomify analytics

updates changelog for 0.6.1

Added main RTL functionality + added Hebrew to modals

move swipe to navigate to individual language files, and test hungarian

default value for options.zoomify.tolerance

add Korean translation