feat(timeline): timeline with tooltips

-- positioning elements
-- added tooltips
feat(tooltips): Tooltip

-- type of tooltip
chore(variables): default-font-size as variable

-- use $base-font-size for default size
refactor(layout): define seperator-class as layout

-- .l-seperator instead .has-seperator
feat(gallery): gallery is responsive now
fix(stage): Reset padding
chore(offline-version): update
Update to 0.3.0