Add a custom_pdf.sty file and backwards-compatibility

[#63237352]
Copy needed files from the template

[Delivers #63237352 Delivers #63220810]
Issue pull request for branch 63237352-custom-pdf

[Delivers #63237352](https://www.pivotaltracker.com/story/show/63237352)
[Delivers #63220810](https://www.pivotaltracker.com/story/show/63220810)
[Delivers #63026420](https://www.pivotaltracker.com/story/show/63026420)
Bump version number
Merge pull request #89 from softcover/63237352-custom-pdf

63237352 custom pdf