Started working on feature #162, some refactoring and preparations to drag multiple items.
Refactoring of addObject to parent to improve readability. Added SB error domain and specific error codes.
Feature working.
Refactoring: Divide and conquer, extract methods where comments were. Some renaming and removed my shortcut to open a specific project on startup.
Fixed: Moving nodes into themselves was possible if placed directly below under the selected node.
Refactoring: removed unused #imports. More extract method. Assert added for not supported index.
Refactoring acceptDrops outline method: extracted methods serving each case.
Fixed: Drag and dropping different resource types will disable dragging #297. Solution: prohibit dropping multiple types.
Right click menu in resource view was limited to textures and folders only. Right clicking will highlight a row.
All resources can be deleted now with the right click option. Deletion works as follows: Right clicking will highlight a single item and delete it when it is outside a selected range of items. If the right click occurs outside a selction without a valid item the selection will be deleted. Behaves like in XCode's project navigator.
Reverted some ill character conversions in comment header.
Merge branch 'develop' into feature/#162_drag_multiple_nodes_on_node

Conflicts:
	SpriteBuilder/SpriteBuilder.xcodeproj/project.pbxproj
	SpriteBuilder/ccBuilder/AppDelegate.m
	SpriteBuilder/ccBuilder/SequencerHandler.m
Improved publishing performance by removing redundant file attrib lookups.
Cache moved up one level to -publishImageFile to remove excessive branching. Complexity is linear now.
Merge pull request #298 from NickyWeber/feature/#162_drag_multiple_nodes_on_node

Feature/#162 drag multiple nodes on node in outline view
Merge pull request #314 from NickyWeber/bugfix/issue_313_delete_wave_files

Fixed: Deleting wave files not possible #313
Merge pull request #320 from NickyWeber/bugfix/issue_294_caching_broken_more_improvements

Bugfix/issue 294 caching broken more improvements
Fixes Cocos2D commit
Fixes SK commit
Merge branch 'develop' of github.com:apportable/SpriteBuilder into develop-steffen

Conflicts:
	SpriteBuilder/SpriteBuilder.xcodeproj/project.pbxproj