Nb-pdf-template

This update simplifies the setup by removing all of the optional extra setup needed for text wrapping. Bonus, compiling is much faster, and prompts are more consistently aligned.

Fixes compiling this template with versions of XeLaTeX from before 2016.

Added the ability to make code cells wrap text. Since, this requires setting nbconvert's latex command to use a -shell-escape, this is not the default. To obtain this feature, install the templates with the --minted flag like:

python -m nb_pdf_template.install --minted

Mostly internal changes to the templates. (Refactoring to make the .tplx files and the intermediate .tex file easier to read, and also to make inheriting from these templates easier.)
Added the ability to use:

--TemplateExporter.exclude_output_prompt=True
--TemplateExporter.exclude_input_prompt=True
--no-prompt


to remove input prompts, output prompts, or both.

Adds text wrapping to Out[] blocks.

Slight improvement to the syntax highlighting of numbers.