New: Migration scripts added to repo (fixes #163)

[swashbuck]

Fix #163

Part of https://github.com/cgkineo/cgkineo/issues/3

New

• Migration scripts added to repo

Migration milestones

3.0.0

• Change global ariaRegion default
• Add global popupPagination
• Add component _hidePagination
• Add component _canCycleThroughPagination

3.1.0

• Change _supportedLayout default
• Add attribution to _itemGraphic in a different commit for 3.1.0

3.2.0

• Add _setCompletionOn

4.0.0 v5

• Add _isRound
• Add item _classes

4.3.0

• Add item _imageAlignment

4.3.2

• Add global item
• Add global previous
• Add global next

4.3.14

• Update default instruction

4.4.2

• Add _showPlusIcon

[swashbuck]

Ready for review