Subset included code files by line number

This commit adds support for extracting individually specified lines
from an included file.

It also:
changes the syntax for specifying git tagged file inclusions to
'git: {tag: a_tag}'."

fixes a bug where retrieving a git tagged file would overwrite
the current working copy.
Subset included code files by line number

This commit adds support for extracting individually specified lines
from an included file.

It also:
changes the syntax for specifying git tagged file inclusions to
'git: {tag: a_tag}'."

fixes a bug where retrieving a git tagged file would overwrite
the current working copy.
Merge branch 'include_code_by_line_number' of https://github.com/skmetz/polytexnic into include_code_by_line_number
Merge pull request #104 from skmetz/include_code_by_line_number

Subset included code files by line number
Add failing test for table numbering

[#76232912]
Fix table numbering

[Delivers #76232912]
[#76232912]

* 76232912-table-numbering:
  Fix table numbering
  Add failing test for table numbering
Bump version number
Merge branch 'master' of https://github.com/softcover/polytexnic
Bump version number
Add support for \url

[Delivers #77386622]
[#77386622]

* 77386622-url-cmd:
  Add support for \url
Allow hrefs in inputted files

[Delivers #77585246]
[#77585246]

* 77585246-href-input:
  Allow hrefs in inputted files
Add support for Pygments lexers of the form 'html+php'
Bump version number
Add test and code for compound language highlighting
Bump version number