chore(gulp): added config-file
feat(*): added assets and dummies for solid demo

-- update paths in patterns
refactor(gulp): remove variables for paths and use own config file, new tasks

-- file build.config.json for paths
-- changed paths in gulpfile
-- added browser-sync instead connect as task
-- added watch-task for dummies
-- added task to copy styleguide from core/ to public/
-- set variable production to true in deploy- and release-task
chore(package): changed name to Gulp-Patternlab, updated gulp and added browser-sync