Update CentOS Kernel.md

#Enable ELrepo

su -c "yum -y install http://www.elrepo.org/elrepo-release-6-5.el6.elrepo.noarch.rpm"

#Install Kernel Mainline Stable

su -c "yum -y --enablerepo=elrepo-kernel find kernel-ml"

Note: 'kernel-lt' is the long term stable branch - 3.10 at time of writing

Update GRUB

sudo vi /boot/grub/grub.conf

Edit 'default=1' to 'default=0'

sudo reboot

Verify

uname -r