default.beamer: Add font theme option

Add font theme option to choose one of the sets of structural fonts
that come predefined with Beamer.
Merge pull request #36 from logc/master

default.beamer: Add font theme option
opendocument template: fixed office:version.
Adds meta tag to allow scaling by the user.  This makes things friendlier for smaller screen sizes.
Merge pull request #38 from ErikEvenson/pr/html5-meta-scale

Adds meta tag to allow scaling by the user.
default.opendocument: Add $font-face-decls$ field.
Merge pull request #41 from wilx/master

default.opendocument: Add $font-face-decls$ field.
opendocument: Replaced fontface variable with actual declaration.
Beamer template:  put slide around bibliography with natbib or biblatex.
ConTeXt template:  setup captions with no numbering.

See pandoc #1067.
ConTeXt template:  Setup up defaults for floats.

This allows the user to adjust the figure and table placement
and numbering globally.
LaTeX template: Add booktabs package
Merge pull request #47 from jlduran/booktabs

LaTeX template: Add booktabs package
Beamer template: add booktabs package
Merge pull request #48 from lionandoil/master

Beamer template: add booktabs package
Added abstract variable in latex template.
latex template:  Put header includes after title.

Closes pandoc#908.
Fixing default.beamer includegraphics redefinition to allow custom options
Merge pull request #49 from lionandoil/master

Fixing default.beamer includegraphics redefinition to allow custom options
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Fixing default.beamer includegraphics redefinition to allow custom options
  latex template:  Put header includes after title.
  Added abstract variable in latex template.
  Beamer template: add booktabs package
  LaTeX template: Add booktabs package
  ConTeXt template:  Setup up defaults for floats.
  ConTeXt template:  setup captions with no numbering.
  Beamer template:  put slide around bibliography with natbib or biblatex.
  opendocument: Replaced fontface variable with actual declaration.
  default.opendocument: Add $font-face-decls$ field.
  Adds meta tag to allow scaling by the user.  This makes things friendlier for smaller screen sizes.
  opendocument template: fixed office:version.
  default.beamer: Add font theme option