Added alternative mail formats view

Added a foreach on swiftmailer message parts to display also the alternate text/html text/plain version of the message.
merged branch alex88/patch-1 (PR #33)

This PR was merged into the master branch.

Discussion
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Added alternative mail formats view

I've added a foreach on swiftmailer message parts to display also the alternate text/html text/plain version of the message.

Commits
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750f809 Added alternative mail formats view