feat(all): update to support ui updates introduced beginning jenkins 1.572 (http://jenkins-ci.org/changelog)

* Reduce Javascript for minimal modification to new UI
* Reduce CSS for minimal modification to new UI
* Introduce tagline-less logo
* Add Vagrantfile for quick jenkins server build
* Update before/after images
chore(images): better images with same dimensions
chore(images): reverse images
docs(README.md): corrections in readme
docs(README.md): add legacy cdn urls