Iron.io config less error prone.

In iron.io settings 'token' is the first field and 'Project ID' is the second. The proposed order makes it less error prone.
Merge pull request #2715 from EvgenyKovalev/patch-2

Iron.io config less error prone.
Add ttr option to beanstalk config.
Updated mail config comments from postmark to mailgun
Merge pull request #2735 from boffey/fix-mail-config-comments

Updated mail config comments from postmark to mailgun
Cleaning up comments.
Merge remote-tracking branch 'upstream/master'