Merge branch 'release-4.2.0'
Merge branch 'release-4.2.0'
ExpectSendToSites fails on StubBus

siteKeys + messages were treated as params object[] during call to
ProcessInvocation
Merge pull request #1789 from chrisbednarski/ExpectSendToSites

StubBus SendToSites implementation calls wrong ProcessInvocation