Sort some badges; add an Activity category (#2448)

lib/all-badge-examples.js

services/categories.js

...eclipse-marketplace/eclipse-marketplace-update.service.js

services/github/github-commit-activity.service.js

services/github/github-commit-status.service.js

services/github/github-commits-since.service.js

services/github/github-contributors.service.js

services/github/github-last-commit.service.js

services/github/github-release-date.service.js

services/npm/npm-type-definitions.service.js

services/php-eye/php-eye-hhvm.service.js

services/php-eye/php-eye-php-version.service.js

services/puppetforge/puppetforge-modules.service.js

services/pypi/pypi-implementation.service.js

services/pypi/pypi-wheel.service.js

...s/stackexchange/stackexchange-monthlyquestions.service.js

services/stackexchange/stackexchange-reputation.service.js

services/stackexchange/stackexchange-taginfo.service.js

services/steam/steam-workshop.service.js

services/travis/travis-php-version.service.js