Add failing test for broken KVO implementations.
Test -rac_signalForSelector: support for -respondToSelector:
Redefine -respondsTo… for -rac_signalFor… on KVO'd target
Make subscription side effects explicit
Comment on the need to implement -respondsToSelector:
Remove stack depth counter.
Simplify the feedback ignoring logic.
Revert "Add failing test for broken KVO implementations."

This reverts commit 737567fded0c76a2c2170cae8a1d992d0d847c68.
u before a, except after c
Letters, how do they work?
Fix misplaced tab
s/is/may be
Use -publish/-connect to cause subscription side-effects
Describe setup of KVO -respondsToSelector: test
Added test for NSController support.
Merge in ext_getImmediateInstanceMethod
Make use of rac_getImmediateInstanceMethod
More detail in -respondsToSelector: comment
Merge pull request #891 from ReactiveCocoa/kvo-respond-to-selector

Implement -respondsToSelector: when using -rac_signalForSelector: on KVO'd target
Merge pull request #895 from ReactiveCocoa/remove-stack-depth

Remove stack depth counter in RACKVOChannel