Build Encore-style Web-based censorship measurement tests

Emma's source code must be compiled before one can run it, which makes it difficult for non-technical users to run emma. (Granted, we can cross-compile a .exe for Windows users but the resulting binary isn't signed and we shouldn't encourage people to run random executables.)

I propose to experiment with a Web-based version of emma. The idea is to point a user to example.com/emma/, which performs the same tests as our compiled executables but it uses JavaScript to get the job done. Here are a few projects that can serve as inspiration:

• Encore: https://censorbib.nymity.ch/#Burnett2015a
• CensorSweeper: https://lists.torproject.org/pipermail/tor-dev/2012-July/003851.html
• I believe that NetBlocks is doing something similar: https://netblocks.org