Change version number & add sed lines to remove old aliases.

packages/nginx.rb

 require 'package'
 
 class Nginx < Package
-  version '1.11.6'
+  version '1.11.6-1'
   source_url 'http://nginx.org/download/nginx-1.11.6.tar.gz' # software source tarball url
   source_sha1 '51903b721a5ee721568fc59f0a243df5356a98de'  # source tarball sha1 sum
   
@@ -19,6 +19,8 @@ class Nginx < Package
     system "echo pages are in /usr/local/nginx/html"
     system "echo adding bash aliases so you can easily start/stop nginx"
     system "echo startnginx starts nginx and stopnginx stops nginx"
+    system "sed -i \'/^alias startnginx/d\' ~/.bashrc"
+    system "sed -i \'/^alias stopnginx/d\' ~/.bashrc"
     system "sed -i '$ a alias startnginx=\"sudo nginx\"' ~/.bashrc"
     system "sed -i '$ a alias stopnginx=\"sudo nginx -s quit\"' ~/.bashrc"
   end