Also new shell script to install Luarocks (for Lua5.3) (on Ubuntu 16.04) and all
necessary rocks.
Updated tg-install.sh to not include all the needless dependencies.
Adds self-hosted, single-realm administrative functions to otouto.
Check out the README for a detailed description.
Also added msg.from.name, which is msg.from.first_name + msg.from.last_name (if it
exists), because I'm too lazy to build it each time.
Fixed a crash-causing bug (ironically) in the handle_exception() function.