Merge remote-tracking branch 'upstream/master'
Merge pull request #2 from MailCore/master

merge lastest MailCore
Fixed #651: interrupt anyway even if IDLE is cancelled early
Initial value for interrupted state of IDLE operation
fixed the architecture warning at first launch in XCODE 5.1
Merge pull request #655 from marcopifferi/master

Fixed the warning that appears opening the project on XCODE 5.1
Fixed IDLE operation interruption
Merge pull request #656 from foxinushka/master

Fixed IDLE operation interruption
Fixed potential crash (fixed #658)
Improved IDLE interruption (#656)
Added sort array in place
Fixed dispatch queue memory management.
Fixed session reuse
Update providers.json

Added MX records for Yahoo mail.
Merge pull request #666 from rlaferla/master

Update providers.json
Fixed #671: workaround bad message encoding
Gitignore file has been improved.
Merge pull request #672 from maximkhatskevich/master

Gitignore file has been improved.
deletion of ending characters made easier
Fixed type conversion