pw_env_setup: disable colors

Temporarily disable colors in pw_env_setup since they don't work
on Macs.

Bug: 150
Change-Id: I04ed0f298345f2fc5092e23049c5da58e6478106
diff --git a/pw_env_setup/env_setup.sh b/pw_env_setup/env_setup.sh
index 5d1ffe4..6e1988d 100644
--- a/pw_env_setup/env_setup.sh
+++ b/pw_env_setup/env_setup.sh
@@ -19,19 +19,23 @@
 }
 
 _pw_red() {
-  echo -e "\e[0;31m$*\e[0m"
+  # echo -e "\e[0;31m$*\e[0m"
+  echo -e "$*"
 }
 
 _pw_bold_red() {
-  echo -e "\e[1;31m$*\e[0m"
+  # echo -e "\e[1;31m$*\e[0m"
+  echo -e "$*"
 }
 
 _pw_green() {
-  echo -e "\e[0;32m$*\e[0m"
+  #echo -e "\e[0;32m$*\e[0m"
+  echo -e "$*"
 }
 
 _pw_bright_magenta() {
-  echo -e "\e[0;35m$*\e[0m"
+  # echo -e "\e[0;35m$*\e[0m"
+  echo -e "$*"
 }
 
 _PIGWEED_BANNER=$(cat <<EOF