get web page from host using httplib
print all the links on the page on stdout
don't print references on the same page
split printLinks to two different methods
modify getPage to use HTTP as default protocol
return list of links found on page instead of printing them on stdout
find union of two lists
modify getPage() to require only url as parameter
fix the bug which made program run in infinite loop
write crawlWeb() function which crawls all the pages reachable from seed
page