Fix ref to custom PDF style file
Restore default italics for filepaths
Remove chapters/*.aux when present

[Delivers #68747820]
[#68747820]

* 68747820-chapters-aux:
  Remove chapters/*.aux when present
Fix a syntax error

[Delivers #68747820]
[#68747820]

* 68747820-chapters-aux:
  Fix a syntax error
Remove generated files from template gitignore

Things like softcover.sty, softcover.css, are generated, so in
in principle they don't need to be versioned, but in practice they
(a) change rarely and (b) are useful to have out of the box when
you clone a repository. This is especially true of the custom styles
for code blocks, which get sucked out of softcover.sty; when that
file isn't in the repository, the first run of a PDF build uses
the wrong font size for code because the softcover.sty file hasn't
yet been copied from the template when the LaTeX-to-HTML conversion
happens. By putting it in the repo, we prevent this issue from
happening.

[Delivers #69120810]
Add pbox to template
Fix a test
media publishing WIP
stubbed specs WIP
updated marketing.yml template

* generated media directory for screencasts
Suppress apparently irrelevant error message that appears only in tests

[Delivers #70183740]
[#70183740]

* 70183740-ghostscript-error:
  Suppress apparently irrelevant error message that appears only in tests
Merge pull request #98 from softcover/media-files

Media bundle support
Merge branch 'master' of https://github.com/softcover/softcover

Conflicts:
	spec/commands/generator_spec.rb
Restore EPUB/MOBI previews
Fix highlight pre margin