Add the option to chose a  WordPress version (svn tag) to install - default is trunk.
Merge branch 'master' of https://github.com/aliso/vvv-site-wizard

Conflicts:
	vvv
Add WordPress version choice to setup script; attempt to verify validity of version number
Merge branch 'pull-10'

Conflicts:
	vvv
Fix 'binary operator expected' error when leaving version number blank
Fix missing backslash causing vvv-init.sh to not be written
Fix errant "ok" file being created when checking an entered version number