[CB-1550] iOS build, debug, emulate scripts should check xcode version
Added 2.3.0 Release Notes
[CB-1988] Update JavaScript for iOS to 2.3.0rc2
Updated Plugin Upgrade Guide to 2.3.0 (also 2.2.0)
Update to 2.3.0rc2
Update guides/Changing the JavaScript to Native Bridge Mode.md
Update project template to have iOS 5.0 as the minimal target.

Also enables ARC by default (not sure why it wasn't already on)
https://issues.apache.org/jira/browse/CB-2092
Fix up invalid #pragma mark lines in our project template.
Revert enabling of ARC in the project template

Turns out we actually haven't updated our template's code to use ARC
yet. We should do this for the next release, but for now it's safer to
just revert this change.
Interim js to fix 2 File API mobile-spec failures
[CB-2088] InAppBrowser - view a video file in fullscreen mode
[CB-2095] Delete incomplete file on filetransfer.abort
Updated js to 2.3.0
Updated VERSION to 2.3.0