Move /etc/bashrc include to be more friendly for OS X

bashrc

@@ -1,6 +1,10 @@
 # If not running interactively, don't do anything
 [ -z "$PS1" ] && return
 
+if [ -f /etc/bashrc ]; then
+    source /etc/bashrc
+fi
+
 if [ -f ~/.bash/environment ]; then
     source ~/.bash/environment
 fi
@@ -39,7 +43,3 @@ fi
 if [ -f /opt/local/etc/profile.d/bash_completion.sh ]; then
     source /opt/local/etc/profile.d/bash_completion.sh
 fi
-
-if [ -f /etc/bashrc ]; then
-    source /etc/bashrc
-fi