Add pbox to template
Fix a test
Add a cover? conditional

[#69782146]
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 branch 'master' of https://github.com/softcover/softcover

Conflicts:
	spec/commands/generator_spec.rb
Restore EPUB/MOBI previews
Fix highlight pre margin
Bump version number
changed the cover images
Update gitignore
Merge branch 'master' of https://github.com/softcover/softcover
Add MathJax to single-page output

[Delivers #60244750]
[#60244750]

* 60244750-mathjax-single-page:
  Add MathJax to single-page output
Merge branch 'master' into full-page
Merge branch 'full-page'
Merge branch 'master' into 69782146-cover-options
Switch to JP(E)G by default

[Delivers #69782146]
[#69782146]

* 69782146-cover-options:
  Switch to JP(E)G by default
  Add a cover? conditional
Bump version number