Add customized LaTeX class and style.

These are the values imported from Sphinx.

Todo: replace contents from InsightArticle.cls and
InsightArticle.sty.
Add sphinxInsightJournal.sty.

This is a version of InsightJournal.sty that plays
nicely with sphinx.sty.
Integrate the rest of InsightArticle.cls into sphinxInsightArticle.cls.
Fix abstract, handle reference, table of contents.
Merge branch 'SphinxPDF'