First implementation of decoy traffic generator.

Should be embedded as an iframe.
cfr. https://github.com/globaleaks/GlobaLeaks/issues/263
Move everything into the index.html file
Move index.html to decoy.html
Copy decoy to build dir.
Bump to version 2.23.13
Merge pull request #77 from globaleaks/feature/decoy

Feature/decoy