Support Keynote 6

[chrisjrn]

Keynote 6 now has an AppleScript API. It is largely similar to Keynote 5's; exports seems to have some minor syntactic changes.

Version of a given app can be found by using applescript

tell application "foo" to version

This returns the version code of foo. A path to a specific app bundle can be provided where foo is.

K6 installation puts K5.x into a separate location on the filesystem.

Behaviour should be:

• If K6 is installed, default to K6 unless overridden.
• If K5 is requested, or K5 is not installed, find and use K5.
• API should only offer an option if K5 and K6 are installed.

[chrisjrn]

Basic K6 support.

K6 currently doesn't support getting the current slide, so we can't support the sync or monitor operations at the moment, alas.