Don't add pandoc-citeproc filter if natbib or biblatex is used

See https://github.com/jgm/pandoc-templates/issues/42
Fixed stupid copy&paste error

How could this happend? sry
Markdown reader:  Fixed regression in title blocks.

If author field was empty, date was being ignored.  Closes #1089.
EPUB writer:  Fixed bug with `--epub-stylesheet`.

Now the contents of `writerEpubStylesheet` (set by `--epub-stylesheet`)
should again work, and take precedence over a stylesheet specified
in the metadata.
Added Cite function to sample.lua.
LaTeX reader: add support for Verb macro
Merge pull request #1090 from jrnold/master

LaTeX reader: add support for Verb macro
Allow use of `\includegraphics[size]` in beamer.

This just required porting a macro definition from the default
latex template to the default beamer template.
Properly handle script blocks in strict mode.

(That is, markdown-markdown_in_html_blocks.)
Previously a spurious `<p>` tag was being added.

Closes #1093.
Docbook reader: Avoid failure if tbody contains no tr or row elements.
LaTeX reader: Support babel-style quoting: `` "`..."' ``.
LaTeX writer: Factored out function for table cell creation.
LaTeX writer:  Better treatment of footnotes in tables.

Notes now appear in the regular sequence, rather than in the
table cell.  (This was a regression in 1.10.)
HLint: Use all

Replace `and . map` with `all`.
HLint: use `elem` and `notElem`

Replaces long conditional chains with calls to `elem` and `notElem`.
HLint: Remove lambdas.
HLint: redundant parens

Remove parens enclosing a single element.
HLint: use /=
HLint: use fromMaybe

Replace uses of `maybe x id` with `fromMaybe x`.
Merge pull request #1099 from hdevalence/master

Minor HLint-suggested changes