WP_Mail delay for Amazon SES

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Amazon SES provides max. 14 outbound e-mails a second, while many mailers, like KNews, require 50 mails per 10 minutes. More than 14 mails a second would result in errors at SES. So if you wait 1/14th of a second each mail you are guaranteed not to send more mails than 14 each second. If there are other mailproviders that require a maximum number of mails per second to be sent this plugin could be a base as well. It does not contain any Amazon SES-specific code, nor does it contain any configuration options. Please feel free to contribute this extra if necessary. It differs from the Delayed Email plugin while that schedules single e-mails for the future while this one just delays and awaits the delay by making the thread asleep for the needed amount of time for Amazon SES to accept new e-mails, but still being able to report back logmessages to mailers like KNews.