Fix handling of power levels when `state_default` is omitted and shou…

…ld be treated as 50 (#22)

Fixes #21

I have not tested the code but I have written Lua before and believe
this is how its nil handling should work

Merge pull request #19 from thermaq/patch-1

Fixed missing method on 3.0 of luajwtjitsi

Merge pull request #11 from anoadragon453/anoa/async_http

Convert User Verification Service check to a non-blocking HTTP call

Merge pull request #8 from matrix-org/jaywink/better-logging

Add some more comprehensive logging

Merge pull request #7 from matrix-org/jaywink/better-moderator-control

Ensure power level sync works properly

Merge pull request #6 from matrix-org/jaywink/debug

Separate power level sync to separate module

Merge pull request #5 from matrix-org/jaywink/room-owner

Sync conference power levels on join

Merge pull request #3 from matrix-org/jaywink/support-matrix-server-name

Support server name passed in Matrix context

Merge pull request #1 from matrix-org/jaywink/use-lua-http

Use lua-http instead of Prosody net.http

Improve readme