util.set: Add set.xor() to get a set consisting of items not in both sets

util.set: Add set:empty() to discover if the set is the empty set

util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators

util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name

prosody: Fire events during server shutdown process

Merge with 0.4.1

core.loggingmanager: Add default logging settings (to console) and fill out code for adding sinks which catch all sources

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mercurial