Ignore additional temporary files in LaTeX projects

From the [latexmk build script](http://manpages.ubuntu.com/manpages/raring/man1/latexmk.1L.html):

  * `*.fls`

From the [biblatex package](http://ctan.unsw.edu.au/macros/latex/contrib/biblatex/doc/biblatex.pdf):

  * `*-blx.aux`
  * `*-blx.bib`
  * `*.bcf`