Popper.js

• docs: fixed some typos and grammar. (#582)
• test: Fix flaky test on IE (#606)
• fix: Get elements ownerDocument for correct measurements (#607)
• feat: Add Flow types to Popper.js (#602)
• docs: fix typos (#616)
• fix(computeStyle): correctly calculate bottom when x="top" and right when y="left" (#612)
• feat: Add specific padding to boundaries (#518) (#615)
• docs: erroneous docs on placement (#623)
• docs: improved issue template
• docs: fix typo on docs ("gzpipped" -> "gzipped") (#631)
• fix: Unignore flow typings from npm publish (#633)
• docs: update ad code
• fix: add missing Data.arrowStyles declarations; (#641)
• fix: add typecript types to npm build (#593)
• refactor: tiny redundancy (#657)
• fix(flow): add event listener methods to Instance (#656)

Tooltip.js

• feat: set custom selectors for tooltip (#644)
• feat: use visibility instead of display for tooltip (#647)
• docs: options.placement only accepts string (#660)