Merge pull request #2 from jroper/admin-section

Added an admin section
Change images
update pdf
Merge pull request #3 from reactivemanifesto/wip-reactive

Change images
Port new contents
Merge pull request #4 from reactivemanifesto/wip-reactive

Port new contents
Fix TOC
Merge pull request #5 from reactivemanifesto/wip-reactive

Fix TOC
Updated version/published date