Added issues from github and suggestions from reddit

Github
https://github.com/zpeters/speedtest/issues/1
https://github.com/zpeters/speedtest/issues/2

Reddit
http://www.reddit.com/r/sysadmin/comments/1ht86k/command_line_interface_to_speedtestnet/
Added '-l' switch to list the servers that speedtest.net is telling us we can test from
Added GLPv3 copyright and some hints on contributing