Adding androidSender source code

This is a very choppy android version of the sender for chromecast -
its been bodged out of the official chromecast video sender example ;-)
Format time as hh:mm:ss with leading zeros if needed

Taken from http://stackoverflow.com/a/12612778
Merge pull request #1 from hugovk/patch-1

Format time as hh:mm:ss with leading zeros if needed
format time properly on the receiver
local copy of socket.io.js - do not assume localhost for socket.io broker
fix typo
make build - still need to make sure it all actually works
was I drunk when I wrote this...
clean up things a bit
documentation and tweaks