Allow xcode 6.0.1 to update the OF project and the OSX project template

For both projects:

- Set the last upgrade check to Xcode 6.0.1
- Set "Build Active Architecture Only" to Yes for Debug scheme

For the template:

- Set "Code Sign on Copy"
- Explicitly set the Architecture to 32-bit (from "native")

The 32-bit one's important. All projects at this point hit the user with two obscure-ish warnings to update their project's settings. Letting Xcode go through with it does this weird thing where it sets your architecture to 64-bit but it still looks like it's building in 32bit, leading to sadness. [More here.](http://forum.openframeworks.cc/t/fix-for-undefined-symbols-when-building-in-xcode-6/16780)

This gets rid of all warnings on OSX as far as I can tell, except for the relevant QTKit deprecation one.