This commit adds a second GnuPG key and signature verification info

We add Sebastian's GnuPG key, move Erinn's key into a sub directory,
add a README to explain Tor's signature verification process, and
we include both keys in the Python setup.py. We use both keys in the
key ring to verify the signature.

In the future, we probably also consider depending on the
package 'deb.torproject.org-keyring' from deb.torproject.org or
including the keys included in that package.
Move images into img directory
Update reference to images to include img directory path
reflow text to meet vim gq standards for 2013
Merge branch 'image-fixups' of github.com:ioerror/torbrowser-launcher into ioerror/image-fixups
merge conflict
 Tor Browser is out of date, the launcher version is not in question (https://github.com/ioerror/torbrowser-launcher/commit/a0bddfc5b9d078e4810d761e6e54e6d739bf9cbd)
removed useless semicolons. I'm not as used to python as other languages :)
changed window title to just Tor Browser, rather than Tor Browser Launcher
prints the Tor Browser Launcher version on start