add vg_be agenda
[vg_be] remove twitter button for now
[vg_be] add 'eva' parser
[vg_be] add jeudi_veggie parser
[vg_be] add Gaia and BiteBack
[vg_be] sort parsers alphabetically
[enh] jeudi_veggie: consider ateliers as a cooking glass

Because life is too short.
[enh] jeudi_veggie: parse the location
[mod] allow a local settings for the vg_be agenda