Default q:quote style for HTML5 template.
Slight change in context template to avoid double spacing.
Better language defaults in LaTeX template.

Thansk to Francois Gannaz.  The lang variable is now included, if set,
in documentclass options.  polyglossia is used instead of babel if
xetex.
LaTeX commands to deal with \euro command with every engine.
LaTeX template: use mainlang variable in \setmainlanguage.
Set mainlanguage for ConTeXt
Fix list labels in beamer.

This code (from the latex template) was causing bullets
and list numbers to extend beyond the left edge of the slide
in beamer.

Removing it seems to fix things.
Merge pull request #6 from adityam/master

Set mainlanguage for ConTeXt
Use mainlang variable to set main language in context template.
Fixed spacing issue in context template.
Added `geometry` variable.
Added romanfont, sansfont, monofont variables to latex template.

Note: These only work with xelatex/lualatex.
LaTeX template: don't use SetupFonts macro.
FIxed spacing in latex template.
LaTeX: use mainfont instead of romanfont, allow multiple geometry.
LaTeX template:  Added mathfont variable.
Updated dzslides styles based on new template.html.
Include PDF metadata (author, title) in latex template.
Removed styling of q in dzslides template.
Better default for q in dzslides template.