Add cslreferences environment definition to template.

From: rstudio/rmarkdown#1649

bibliography.bib

@@ -23,7 +23,7 @@ @book{nightwood
 }
 
 @article{de_lauretis_nightwood_2008,
-  title = {Nightwood and the \mkbibquote{{{Terror}} of {{Uncertain Signs}}}},
+  title = {Nightwood and the \textbackslash{}mkbibquote{{{Terror}} of {{Uncertain Signs}}}},
   volume = {34},
   issn = {0093-1896},
   doi = {10.1086/529092},
@@ -51,7 +51,7 @@ @incollection{wells-cartographie
 }
 
 @article{fama_melancholic_2014,
-  title = {Melancholic {{Remedies}}: {{Djuna Barnes}}'s \mkbibemph{{{Nightwood}}} as {{Narrative Theory}}},
+  title = {Melancholic {{Remedies}}: {{Djuna Barnes}}'s \textbackslash{}mkbibemph{{{Nightwood}}} as {{Narrative Theory}}},
   volume = {37},
   issn = {0022-281X},
   doi = {10.2979/jmodelite.37.2.39},
@@ -64,9 +64,9 @@ @article{fama_melancholic_2014
   author = {Fama, Katherine A.}
 }
 
-@article{wallace_mkbibquotemy_2016,
+@article{wallace-nightwood-publics,
   langid = {english},
-  title = {\mkbibquote{{{My History}}, {{Finally Invented}}}: \mkbibemph{{{Nightwood}}} and {{Its Publics}}},
+  title = {\textbackslash{}mkbibquote{{{My History}}, {{Finally Invented}}}: \textbackslash{}mkbibemph{{{Nightwood}}} and {{Its Publics}}},
   volume = {3},
   issn = {2327-1590},
   url = {https://muse.jhu.edu/article/647658},
@@ -81,7 +81,7 @@ @article{wallace_mkbibquotemy_2016
 }
 
 @article{glavey_dazzling_2009,
-  title = {Dazzling {{Estrangement}}: {{Modernism}}, {{Queer Ekphrasis}}, and the {{Spatial Form}} of \mkbibemph{{{Nightwood}}}},
+  title = {Dazzling {{Estrangement}}: {{Modernism}}, {{Queer Ekphrasis}}, and the {{Spatial Form}} of \textbackslash{}mkbibemph{{{Nightwood}}}},
   volume = {124},
   issn = {0030-8129},
   url = {https://www.jstor.org/stable/25614321},

template.tex

@@ -8,6 +8,15 @@
   oneside
   ]{memoir}
 
+$if(csl-refs)$
+\newlength{\cslhangindent}
+\setlength{\cslhangindent}{1.5em}
+\newenvironment{cslreferences}%
+  {$if(csl-hanging-indent)$\setlength{\parindent}{0pt}%
+  \everypar{\setlength{\hangindent}{\cslhangindent}}\ignorespaces$endif$}%
+  {\par}
+$endif$
+
 %%% Font selection
 $if(pdf-options.font)$
 \usepackage{fontspec} % Choose fonts intelligently