Add default robots.txt replyt to built-in HTTPD
Add default robots.txt replyt to built-in HTTPD

lyoshenka/PyPagekite,output/PyPagekite,pagekite/PyPagekite,lyoshenka/PyPagekite,output/PyPagekite,pagekite/PyPagekite,pagekite/PyPagekite,lyoshenka/PyPagekite,output/PyPagekite