Add ARC workaround for be_nil and be_same_instance_as matchers.

[Fixes #46780343]
Added ARC specs to iOS target. Added more examples.

reinterpret_cast expectedValue_ for be_same_instance_as.

Examples now cover __strong & __weak objects.
Add ability to stop spying
Small style fix
Fix bad access on originalObject
Merge pull request #141 from Clinkle/master

Add ability to remove a spy (via stop_spying_on)
Added tests for spying on objects those using KVO
Fixes some basic edge cases with spies and KVO

- Spies can record KVO-related messages sent to and from observed objects.
- Moves spec helper objects into support group (not like it sounds)
- TODO: expand specs to include tests around collection observing.
- TODO: while under KVO, spies may not record messages sent to themselves.

Special thanks to Pavel Taykalo for raising some of these issues
and providing useful failing specs.
Refactor some spy-related internals

- extract method for deciding to use private IMP
- clarify use of spied class vs. original public class
- remove near duplicate private method
Merge pull request #140 from akitchen/KVOSpies

Improves spies when used in combination with KVO
Merged with latest master.

master-ref: 011db95e5425fd20ade3ae00b1a652b2af2f7f64

Conflicts:
	Cedar.xcodeproj/project.pbxproj
Change specifed to specified
Merge pull request #143 from carsonmcdonald/specifedtospecified

Change specifed to specified
Include ConformTo.h in static lib
Merge pull request #144 from tjarratt/fix_static_lib

Include ConformTo.h in static lib
Merge pull request #123 from jeffh/arc

Added ARC support (fixed ARC-related errors for be_nil and be_same_instance_as matchers).
Added a target for testing Cedar-iOS.framework

Only a few lightweight specs are included for now
Merge pull request #147 from akitchen/iOSFrameworkSpecsTarget

Added a target for testing Cedar-iOS.framework
Revert "Added a target for testing Cedar-iOS.framework"

This reverts commit d41fb129f42b1bf8f5ad5b507d6a764b4c9e8573.
iOSFrameworkSpecs fail if iOS framework is broken

If generated Cedar-iOS is missing headers, this will fail to build.
Can be used as a compile & test target for Cedar-iOS framework.
This target should never #import "SpecHelper.h" directly.