Update link to slides to use slideshare

That way people can just view the presentation without downloading it, if they'd like.
Merge branch 'release/0.22.0'
Merge README changes
Merge branch 'release/0.22.1'
Fix issue where filter_megam and join_megam were still using old _megam_dict_iter function instead of _MegaMDictIter class.
Merge branch 'hotfix/0.22.2' into develop