Merge pull request #23 from hashworks/fix/pluginshutdownonsignal

Call plugin destroy methods before shutdown on signal
Merge pull request #17 from hashworks/fix/cleanup

Refactoring: Code cleanup
Merge pull request #18 from hashworks/fix/thirdpartyinfo

Move thirdparty-plugins/links.php info to README
Merge branch 'master' of https://github.com/Ueland/VikingBot