Merge pull request #6 from sartmann/master

Minor spelling and grammar mistakes fixed.
[WEBSITE] improved installation.rst + several minor changes
[FIX] avoid running integration in parallel inside a daemon process

    nested running of multiproccssing, eg parallel execution of
    integration inside a parallel running workflow is not allowed.
    This commit fixes several sources for such an error.
[WEBSITE] updated tour.rst for pm explorer
[WEBSITE] updated tour.rst for metaboff feature finder
[DOCS] updated doc string for ff batches
[INSTALLER] created windows bootstrap installer