allow folder sharing between host and VMs
small cosmetic tweaks
Move folder_sharing to the same location as node's.
Merge branch 'refs/heads/AntonioMeireles-shared_home'
Merge branch 'cosmetics_1215' of https://github.com/AntonioMeireles/coreos-cluster into AntonioMeireles-cosmetics_1215
Make the global cluster variable upper-case
Merge branch 'refs/heads/AntonioMeireles-cosmetics_1215'
In the case if VAGRANT_DEFAULT_PROVIDER is set
Fix a bug with hostname in VMs
Merge branch 'master' of https://github.com/AntonioMeireles/coreos-cluster into AntonioMeireles-timezone_support