Change cable links at svg to ssl

Removed the hard-wired http prefix in the code. It's now in the `*.map` files.

* `wikileaks.org.map` (the default) contains ssl wikileak links

* `cablesearsh.org.map` is **non ssl**, but I like the inteface there,
  so you can use it locally via tor (or not - if you're sloppy),
  but this should be avoided for stuff you publish widely.
change all.map to wikileaks.org.map in README
Merge pull request #27 from thedod/master

Change cable links at svg to ssl