add script that auto-adds fronts/masquerades provided in a text file

Also add all the known Cloudflare fronts in the global list of Alexa top 20000
domains.

This is as of yet untested, but I'm missing some flashlight dependencies
locally and I can't run 'go get' until I push this, since I'm myself adding
a 'config' module.
fix package name
Merge branch 'master' of github.com:getlantern/flashlight
Merge branch 'master' into add-masquerades
change package name in the right place...
voodoo
add an empty file for convenience when you want to remove a domain
remove unused jinja template, update README
remove unnecessary package, improve name of masquerades config file
add script to refresh certs

This is a bit of feature creep, but involves practically no new logic and can
be tested trivially and locally.
reverse order of tls versions to try
fix failure to update Go config filename in generating script
collect errors instead of halting
more masquerade.go fixes I had forgot to backport to the generating script :(
four certificates changed since last scan
remove unused import
better handling of old versions of OpenSSL and errors getting certs
catch IOErrors too
README updates
Merge branch 'add-masquerades' of https://github.com/getlantern/flashlight into add-masquerades