Inlining BibTeX bibliography in LaTeX file

You can include it using the filecontents environment:

\usepackage{filecontents}
\begin{filecontents}{example.bib}
% File contents here
\end{filecontents}
\documentclass{article}
...

This will extract the file only if it does not already exist locally. (You'll see this approach used a lot for examples on sites such as this one. It's handy for small snippets but is more awkward when things get very long.)

You should use a revision control system for multiple author documents. There are a lot of programs like subversion or git or ... That makes the email exchange superflous and you get a backup system, too.