Ready event signature fixed for consistency

Signature now handlerMethod(eventSource, eventData)
changelog.txt updated for breaking change

TileSource ready event handler method signature changed
Fix for touch event issue #240
changelog update for touch event issue #240
Merge pull request #239 from msalsbery/TileSource-Event-Signatures

TileSource 'ready' event signature fixed for consistency (#224)
Merge pull request #242 from msalsbery/Touch-Bug-Fix

Fix for touch event issue #240
changelog.txt update for event signature change
Merge remote-tracking branch 'origin/Touch-Bug-Fix'
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' into Button-Event-Signatures
Post-merge quick fix