2.2.13 released

[Mikel Lindsaar]

Hi all,

Just released 2.2.13. This has been a community release and also cleaned up a lot of warnings in Ruby 1.9.2

Changelog:

* Added backport fix for net/smtp bug (Aaron Patterson)
* Changed "Mail#text_part" so that it does not return a plain text attachment (Anton Mironov)
* Added in rescue blocks for badly formatted dates as well as encoding problems (Karl Baum)
* Fixed warning errors of duplicated regular expressions (Kouhei Sutou)
* Removed duplication from Regex's containing [\w\d]+ as \w contains \d (mikel)
* Add authentication selection for imap retriever (Björn Albers)
* Removing warning on @name not being initialized (mikel)
* Version bump to 2.2.13 and gem release

Thanks all for your awesome work.

Mikel