I think there is a bug in the Swedish ruleset. In both the DefaultRuleProvider and swedish.json file we have the following problems:

• Å and å is missing
• ö is changed to "ö" (instead of "o")

It looks like this in DefaultRuleProvider:
'swedish' => array ( 'Ä' => 'A', 'Ö' => 'O', 'ä' => 'a', 'ö' => 'ö', ),

And like this in swedish.json:
{ "Ä": "A", "Ö": "O", "ä": "a", "ö": "ö" }

I could create a pull request I guess. Im just not sure if Im missing something obvious here. Let me know if you want me to send a PR. :)