Quote a few variables in provision.sh

Quoting prevents word splitting and glob expansion, and prevents the script from breaking when input contains spaces, line feeds, glob characters and such.

If `var=my value`, the space is retained with quoting. Otherwise it will split and provide unexpected results. Nothing in the provision script is currently broken, its just a best practice to do it this way.
Yup, nesting them is all good. 

Brad Parbs

> On Dec 15, 2014, at 11:41 PM, Jeremy Felt <notifications@github.com> wrote:
> 
> In provision/provision.sh:
> 
> > @@ -600,12 +600,12 @@ for SITE_CONFIG_FILE in $(find /srv/www -maxdepth 5 -name 'vvv-nginx.conf'); do
> >  	DEST_CONFIG_FILE=${SITE_CONFIG_FILE//\/srv\/www\//}
> >  	DEST_CONFIG_FILE=${DEST_CONFIG_FILE//\//\-}
> >  	DEST_CONFIG_FILE=${DEST_CONFIG_FILE/%-vvv-nginx.conf/}
> > -	DEST_CONFIG_FILE="vvv-auto-$DEST_CONFIG_FILE-$(md5sum <<< $SITE_CONFIG_FILE | cut -c1-32).conf"
> > +	DEST_CONFIG_FILE="vvv-auto-$DEST_CONFIG_FILE-$(md5sum <<< "$SITE_CONFIG_FILE" | cut -c1-32).conf"
> From the surface, this seems like it could cause an issue. Does the nesting of double quotes work?
> 
> —
> Reply to this email directly or view it on GitHub.
>