Support for vagrant 1.2.0 added
prep. 0.7.2 dev version
Work around vagrant reloading errors

Also bring back simple reload to avoid provisioning run twice.
moving translation keys out of vagrant scope

avoid accidental interference with vagrant translation keys by moving from "vagrant.plugins.vbguest" into "vagrant_vbguest".
Refactored vagrant version compatibility
when waring about vagrant reload issue, prepare the user to expect errors
tweak auto_reboot disabling override

 whithin vagrant 1.1.x, allow vagrant 1.1.4 and 1.1.6 or higher
Add 0.7.2 change-log section
Add compatibility layer for vagrant 1.2.x

moving linux's `distro_dispatch` into that new compat-layer
refactor Downloader for vagrant 1.2 compat

while keeping compatibility to vagrant 1.1 and 1.0
prepare 0.8 release (vagrant 1.2 support)