Fix test + remove buffer options + return nb pages

[Atinux]

Hello!

Thanks for your awesome node module!
I removed the buffer option in this version (already deprecated in
0.3.0) + the script return a JSON with the number of pages in the PDF!

I also updated the README and the documentation!

I you like it, don’t forget to npm publish :)

Regards,
Sebastien

[marcbachmann]

Thank you for your contribution.
Sorry, I haven't set up appveyor or travis correctly. I'll have a detailed look into your pull-request somewhen this week.

[Atinux]

Thank you :)

[Atinux]

I added the tests for Travis and AppVeyor too!

[marcbachmann]

I suggest you to do version bumps always in the master branch after a feature is merged. It looks strange if there are that many other commits after creating a changelog with a specific version.

[Atinux]

You right!

[marcbachmann]

I'd like to have the pages in the response. But sadly this only works if we define a header or footer because we only execute that method when rendering headers or footers. That might look buggy.
What do you think about that?

The travis config is also ok to merge. Can you create a new pull-request only with the travis file? I can merge that directly. I'll implement appveyor separately (for windows tests).

With the other things i'd like to wait because I've changed the api a bit.
I hope I didn't discourage you with my many comments and requests. Thanks again for your work.

[Atinux]

I agree, this is annoying that we cannot have the right number of pages without a header or footer given.

I think you can forget this pull request if you changed the API, just maybe be inspired for futur changes by what I've done.

:)