Travis updates to work with skeleton test file.
Skeleton test file for CI.
Require PHP 5.5. Guzzle 6.x only works with 5.5 and greater.
Remove TODO. It's done.
Issue #2655520: Added more information to the body field. And address section was added to give better insight into the Sendgrid object that is created in sending an email.
Issue #2655940: Hook mail change to support a Reply-To header since core does not.
Issue #2655940: Update reply to field so it acts like the rest with defaults.
More documentation on installation.
Issue #2659148: Update Readme for more detailed information about Composer
Issue #2657930: Correct the configuration link showed in the modules list.
Issue #2656738: Send test page should support all possible options
Issue #2656090: Update to latest library to support attachments.
Issue #2656090: Changing parameter name for the test file attachment.
Remove mime stuff and initialize variable so PHP doesn't throw a notice.
Properly handling the names. Don't populate if empty.
Issue #2655520: Attachment information is now in the devel message and logging.
Issue #2656090: Testing feature of the module to support attachments.
Issue #2655940: Support ReplyTo
Issue #2656678: Correct saving of API key. Don't throw an error if the key already exists. Change array() to .
Issue #2655520: Delete new variables on uninstall.
Issue #2655520: Needs testing. 90% solution for this issue. Also convert array() notations to short 
Double quotes to single quotes.
Issue #2655520 by DamienMcKenna, Perignon: Admin UI changes.
Issue #2655520 by Perignon: Documentation and info file updates to support Maillog.
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