Explicitly including LaTeX modern style in Travis build
Explicitly including LaTeX modern style in Travis build

This should fix the error on Travis:

    :userguidePdfpandoc: Error producing PDF from TeX source.
    ! LaTeX Error: File `lmodern.sty' not found.
    Type X to quit or <RETURN> to proceed,
    or enter new name. (Default extension: sty)
    Enter file name:
    ! Emergency stop.
    <read *>

    l.4 \usepackage
     FAILED
    FAILURE: Build failed with an exception.

benvanwerkhoven/Xenon,NLeSC/Xenon,benvanwerkhoven/Xenon,NLeSC/Xenon