Dipole-antenna shower plugin for Pythia8

Current versions

vincia requires the following formulae to be installed:
pythia 8.230 Monte Carlo event generator
wget 1.19.4 Internet file retriever

Recent formula history

David C Hall pythia 8.230, vincia 2.2.01
David Hall Travis-CI uses brew test-bot Copied .travis.yml from brew-tap-new script. This should make for quicker testing, because only the edited formula is tested. Also moved formulae to Formula folder.

Formula code at GitHub