add pptp doc
remove sponsor section
build OpenStack local dev/test environment
add http proxy for apt-get
add format json file
add show filtype in VIM
add view file history command in git
add nfs package to ubuntu tips
update kvm doc
add resize image file comment
add centos doc
update to new commit
add aufs doc
initial doc for mesos
initial doc for kubernetes
remove hostname override in kubelet
update centos quick start
Revert "remove hostname override in kubelet"

This reverts commit 6739421e4421b60588f8378a7135f5734ac8be66.
Merge pull request #1 from chenzhiwei/master

Update