fix quotation issues by using a bash array

see: http://mywiki.wooledge.org/BashFAQ/050

plugin/someteam.example.com/v1/sedtransformer/SedTransformer

@@ -2,10 +2,9 @@
 
 # Skip the config file name argument.
 shift
-
-args=""
-for arg in $@; do
-  args="$args -e $arg"
+args=()
+for arg in "$@"; do
+  args+=(-e "$arg")
 done
 
-cat - | sed $args
+sed "${args[@]}"