mod_rest: Add XEP-0066 to mapping schema (breaking from previous jsonmap) before: oob_url: http://example.com/ after: oob: url: http://example.com/ desc: optional description Deals with the fact that the name and namespace differs based on whether it's in an iq or message stanza, unlike oob_url

This module logs events where more than a certain amount of CPU time was
spent.

``` lua
log_cpu_threshold = 0.01 -- in seconds, so this is 10 milliseconds
```

Uses the Lua
[`os.clock()`](http://www.lua.org/manual/5.2/manual.html#pdf-os.clock)
function to estimate CPU usage.