Bug 9150: Make RPATH unavailable on Linux builds.

Thanks to a patch by a cypherpunk we make now RPATH unavailable on Linux
builds.
Include the Go license as required for certain PTs.

Go license taken from http://golang.org/LICENSE?m=text

Fixes bug #13039.
Use meek 0.11.

0.11 has a fix for #11612, which would prevent some users from being
able to bootstrap for the first time.
Bug 13091: Use "Tor Browser" everywhere (space included)

Use "TorBrowser" instead "Tor Browser" in Info.plist on Mac OS.
Merge remote-tracking branch 'pc/bug13091'
No need to apply the patch for bug 8402 anymore.

Bug 8402 landed on tor master recently which breaks compilation if we'd
still apply the patch for it when building nightlies.
Changelog for 4.0a3 and versions bump.
Use latest NoScript for nightlies.
Change the URL to the NoScript .xpi, too.
No patch for bug 11200 when using tor 0.2.5.7-rc.

tor 0.2.5.7-rc already includes the fix for bug 11200 which breaks our
build as we try to apply it, too. Thus, we remove it if building
bundles with a tor 0.2.5.x from now on.
Bug 13031: Adding full RELRO protection on Linux.

Thanks to a patch by a cypherpunk we have now full RELRO protection when
using gold as our linker.
Update changelog file.
Bump versions and update changelog for 4.0a3.
Update changelog for 3.6.6, and add an omission to 4.0a3.
Update subkeys for Mike Perry.
Remove Torbutton 1.6.12.3 from 3.6.6 changelog.
Revert "Remove Torbutton 1.6.12.3 from 3.6.6 changelog."

This reverts commit 12f43a2f34f5341b66ae259bf26c78d7a8d89544.

Ah, screw it. Let's keep it! What could possibly go wrong!
Use SHA for Torlauncher due to gpg+git tag timestamp braindamage.
Also update the tag verification for Tor Launcher..
Also switch gitian to commit hash.