Add Slovak translation
Add Slovak to the list of supported languages
Add IMAP provider info for fastmail.fm

Lets K9 automatically configure the IMAP and SMTP ports for fastmail.fm
accounts.
Merge pull request #329 from sjbarag/FastmailProviderConfig

Add IMAP provider info for fastmail.fm
Update providers.xml

about 70% of russian mailboxes. it works
Replace synchronous setting of a flag with async setting of the flag. This helps speed up message display time (anecdotally)
Marking a message as read in the database is currently very expensive, especially if you have threading enabled.

Defer that until _after_ telling listeners that they're cool to show the message
Opening a folder (especially in threaded mode) does a very heavy SQL query. This method doesn't use or modify the folder object.  Don't cargo-cult the Open here.

(cketti may well tell me I'm wrong about this. Happy to listen & fix)
4.506 changelog
Bumped manifest to 4.506
SK translation - fixes
Sk fixes
Update providers.xml

updated
Updated Japanese translation of the changelog.
Merge pull request #330 from bboa/master

Added Russian mail providers
Add Russian ISPs -> changelog
Another fix
Updated/fixed polish translation.
Polish translation updated - remote search left.
Polish translation - quick fixes.