WIP Sprite9 Validation.
looping animation unit test.
add Animation Tests for chaining and seeking.
invisibility test.
tests cleanup.
remove spam print.
Merge branch 'develop' into sprite_9_validation
Sprite 9 validation improvements.
Merge branch 'develop' of https://github.com/spritebuilder/SpriteBuilder into develop
zero duration animation unit test.
limit spring stiffness.
add comment to tests.
Merge branch 'develop' of https://github.com/spritebuilder/SpriteBuilder into develop
Merge branch 'develop' of https://github.com/spritebuilder/SpriteBuilder into develop
Initial version of Sprite Builder Pro Installer.
SBPRo version written.
Install file version stored in Xcode.
Android plugin version file working well.
fix up error detecting.
Package migration rollback added.