Updating the README

Updating the README to fix the error:

"uninitialized constant Vagrant::Action::Builtin::MixinSyncedFolders"

Looks like vagrant-libvirt requires vagrant 1.4.3.
Trying to make README easier to understand
fixes #4852 - make sure we install katello-installer RPM for dev setup
Merge pull request #28 from mccun934/20140325

fixes #4852 - make sure we install katello-installer RPM for dev setup
Changing hostnames to avoid clashes
Merge pull request #27 from daviddavis/readme-update

Trying to make README easier to understand
Merge pull request #31 from daviddavis/temp/20140326180556

Changing hostnames to avoid clashes
README: Fixing typos and such
Merge pull request #32 from daviddavis/temp/20140326171059

README: Fixing typos and code
Setting rsync specifically to prevent NFS mount until boxes are updated with NFS.
Merge pull request #33 from ehelms/set-rsync

Setting rsync specifically to prevent NFS mount until boxes are updated ...
Merge pull request #26 from daviddavis/temp/20140325103118

Updating the README
Using older version of vagrant due to rsync issues
Merge pull request #34 from daviddavis/temp/20140328155016

Using older version of vagrant due to rsync issues
Adding some clarity around how to install Vagrant for beginners.
Merge pull request #35 from ehelms/readme-updates

Adding some clarity around how to install Vagrant for beginners.
do not use forwarded_port with libvirt as it breaks networking
Merge pull request #37 from jlsherrill/network_fix

do not use forwarded_port with libvirt as it breaks networking
Eliminate bootstrap scripts and push repo setup to setup.rb.

We now assume the user knows to register if necessary (on RHEL), and yum
install ruby. After this we try to do everything in setup.rb.
Update setup.rb for user specific devel setups.