Change CZML polyline defaults

The old default was 0 and I accidentally switched it to 1 in the last great refactor. 0 is the better choice.

Fixes #1249
Remove 'on' prefix from event names
Update CHANGES.md
Rename onDropError to dropError
Update CHANGES.md
Merge pull request #1309 from AnalyticalGraphicsInc/issue1249

Change CZML polyline defaults
Merge pull request #1301 from andre-nunes/events

Remove 'on' prefix from event names
Merge remote-tracking branch 'upstream/master'

Conflicts:
	CHANGES.md