Merge pull request #712 from khawkins/master

iOS: 2.3 Release
What's new for 2.3
Hybrid upgrade steps
Post-create steps should probably be numbered
Some upgrade note revisions, based on feedback
Fixing wording
Fixing wording
Adding old upgrade notes back, as we'll save the previous version
Adding native upgrade steps, adding note about prior version upgrades
Merge pull request #716 from khawkins/readme

What's new for 2.3