remove log.
Fixes:  File view: delete selected files with backspace deletes first entry #323.
Merge pull request #324 from NickyWeber/bugfix/issue_323_backspace_delete_removes_first_entry

Fixes:  File view: delete selected files with backspace deletes first entry #323.
Merge pull request #321 from KoboldKit/develop-steffen

button node + sb plugin
Update cocos2d.
Fix project settings.
Merge branch 'develop' of https://github.com/apportable/SpriteBuilder into develop

Conflicts:
	SpriteBuilder/SpriteBuilder.xcodeproj/project.pbxproj
revert spritekit change.
Merge pull request #325 from jtwigg/develop

Develop
remove "Joints" from sequencer in SK projects
fixed actual (and possible) crashes accessing index 0 of potentially empty arrays
fix relative position type, and changes in position type for SK
fix contentSize editable
updated SK default project with label position centered on % of parent container
added zPosition property to nodes
update SK default project with zPosition usage
fix % relative position not calculated for some node types
fixed saving changes position slightly (of children with % positioned parent)
updated SK default project
update SB+SK submodule ref