removed definitions/* from .gitignore file
added holusion-base definition
removed unused alias from .rvmrc
switched from .rvmrc to ruby-version
Add new build hook: before_postinstall
Add build hook before_postinstall to documentation
Merge pull request #917 from I2SE/before_postinstall

Add new build hook before_postinstall
changed home dir for vagrant user from /home/vagrant to /vagrant
now installing sudo
clean all instead of clean
minor adjustments
removed unused postinst
Fix whitespace handling for vm_flags
Fix whitespace handling for box export
Update basics.md

Otherwise the build fails on ubuntu boxes
Merge pull request #918 from stenver/patch-1

Update basics.md
Merge pull request #919 from I2SE/fix_ws_handling

Fix vbox build if name contains spaces
now building fine against local repository with current installer iso
now not requiring group vagrant to exist
Merge branch 'base'

Inclusion of custom definitions