add VoidEvent
adds priority version of Void delegate/expire/strategy
testsuite for void event
Merge pull request #72 from arturoc/feature-voidevent

add VoidEvent
Update CHANGELOG
Fix documentation: OptionException gets thrown by a validator, not InvalidOptionException.
Merge pull request #76 from rettichschnidi/rettichschnidi-fix-validator-docu

Fix documentation: OptionException gets thrown by Poco::Util::Validator
GH #80: NumberFormatter::append broken

fixed GH #80: NumberFormatter::append broken
Merge branch 'develop' into custom