project files now use n2d extension
open project file chooser now only shows you files with .n2d extension
Added ability to rename current scene.
Merge pull request #1 from nebula2d/development

Development
Started work on project building.
ensure cleanup actually happens on shutdown.
minor refactoring
fixed bug where dialogs weren't being disposed on close, causing the application to not completely shutdown, causing potential memory leaks.
a little more refactoring...
Fixed typo in new component popup
settings work and jarring work
settings bug fixes
more project build work.
build from source instead of extracting and twiddling jars
fixed major memory leak. Spritebatches were being created every frame and never destroyed, so memory was just being eaten fast. Also fixed a bug where the application wasn't being cleaned up properly.
Merge pull request #71 from jonbonazza/master

lots of features, bug fixes, and enhancements