./project: new --refresh-bib to force-build bibliography

Until now, the bibliography was only re-built when 'tex/src/references.tex'
was modified. This is useful in many regular cases because building the
bibliography can slow down the build and it is in-efficient to built it in
every edit of the text of the paper. However, it can be inconvenient when a
change in the paper's bibliography is necessary, without actually editing
'references.tex' (for example when you are removing a citation from the
text).

This happens because Make is only sensitive to file modification time. In
this case, Make does not see the need to create a new 'bib' file because
the 'tex/src/reference' is not changed, and only the 'paper.tex' is
changed. Make is totally 'blind' to the new 'citation' defined in
'paper.tex'.

As a workaround, until now users were forced to manually change the
'tex/src/references.tex' file modification date: either by altering the
content, or using the 'touch' command.

With this commit, the '--refresh-bib' is added to './project' arguments to
address this issue. It will just 'touch' the 'tex/src/references.tex' file
before calling Make. In effect, this will 'force' Make to create the
bibliography file, even if 'tex/src/references.tex' hasn't been updated.

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