Release 0.4.2. Fixes #50, thanks to @Jeavon pull request #42.

Tests: drop is_ie conditional when checking for webp and devicepixelr…

…atio. Was catching Chrome/Mac

Tests: revert accidental integration_browsers.js commit; resume tests…

… on all browsers.

Bugfix: indexing typo, works by coincidence on most browsers. Affects…

… 0.2.4 and higher.

Fix typo preventing tests from completing. Add readme status badges.

Add 0.2.5 release notes.

Lint the tests (and fix a couple lint errors)

Update README.md