Adding the possiblity to define engine options.

That way we can set any options the engine may have, or override any hardcoded/default options.
i.e: http://madalgo.au.dk/~jakobt/wkhtmltoxdoc/wkhtmltopdf-0.9.9-doc.html
Creating a mocked binary of wkhtmltopdf to run on Travis.
Merge pull request #32 from renansaddam/feature/WkHtmlToPdfOptions

Adding the possiblity to define engine options.
adding tests for rendering plugin views and layouts, fixes #34
fixing typo
Set explicit installer-name
Merge pull request #35 from uzyn/master

Set explicit installer-name
fixing typo

As described in issue #15 on your issuelist ;)
The person just copied and pasted your example code.

https://github.com/ceeram/CakePdf/issues/15
Merge pull request #36 from turnred/master

fixing typo