draft.tex

% draft stuffs
\usepackage{lineno}
\usepackage{totcount}

\@ifpackageloaded{lineno}{}{\newcommand\linenumbers\relax}

\@ifpackageloaded{totcount}{
  \newtotcounter{citnum}
  \AtEveryBibitem{\stepcounter{citnum}}
  \newcommand\refcount{\todo{This document contains \total{citnum}\ references.}}
}{
  \newcommand\refcount\relax
}

\usepackage{ifdraft}
\ifdraft{
  \@ifpackageloaded{tikz}{
    % http://tex.stackexchange.com/a/82224/128303
    \pgfkeys{/pgf/images/include external/.code=\includegraphics{#1}}
  }{}
}