removed whats new section

Changelog is kept in bosh github repo: https://github.com/cloudfoundry/bosh/blob/master/CHANGELOG.md
simplify deploy MicroBOSH to AWS tutorial
rearranged drain script documentation
rearranged index.html
simplify errand example
add vm-anti-affinity doc
remove resource pool size from exampls
Merge pull request #23 from cloudfoundry/dk_updates_1

Updates from BOSH team