LaTeX publish does not respect nested itemize

[LarryK82]

Markdown uses indentation to create nested itemizes. The LaTeX Export only creates one \begin{itemize}...\end{itemize} scope and ignores the indented "*" items

This is caused by the regex searching for "beginning of line followed by * or - or +" and will also affect the creation trigger of \end{itemize} (currently empty line).

Steps to reproduce: Create a requirement with nested unordered lists and export to HTML and to LaTeX. LaTeX fails (poor Donald E. Knuth will be sad)

`

• asdf
• Abcd
  • xyz
  • QWERTY `