Make revagrant work correctly

If revagrant is written as a simple alias, "revagrant local" does not
work as expected. It runs "vagrant destroy -f && vagrant up local",
which destroys ****ALL**** VMs and then re-creates local, instead
of destroying local and recreating it. Yeah.

config/.bash/aliases.bash

@@ -115,7 +115,10 @@ function grh () {
 }
 
 alias vag="vagrant"
-alias revagrant="vagrant destroy -f && vagrant up"
+
+function revagrant () {
+	vagrant destroy -f $1 && vagrant up $1
+}
 
 alias convert_to_utf8="perl -MEncode -ne 'print encode_utf8(encode_utf8(eval { decode_utf8(\$_) } || decode(q{cp-1252}, \$_)))'"