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