Update for Laravel 4.2

This is likely to fail on L4.1 as the $app['events'] parameter was only introduced in L4.2, but I'm unsure how to prevent it installing on that version. Hopefully there won't be too many L4.1 instances in the field.

Requirement for Laravel 4 only (not working on Laravel 5)

1.0.5

Update README.md

Fixes to Issue #1 - exclude headers that should not be included in the signature

1.0.4

Update to 1.0.4

Issue #1 ignore some headers

Workaround for swiftmailer/swiftmailer#442

Fix to composer.json

1.0.2

Fix to composer.json

Update to installation instructions.

1.0.1

Up version 1.0.0 to 1.0.1