KVO Workaround#8

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PsychoH13 wants to merge 17 commits intomikeash:masterfrom

PsychoH13:master

Commits on Oct 6, 2011

Added KVO workaround. The workaround allows to reference weakly an object that already has KVO observers and still keep the zeroing power.
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Cleanup hack.
PsychoH13
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Commits on Oct 27, 2011

Commits on Nov 21, 2011

Commits on Nov 22, 2011

Macros modified to allow returning any kind of data.
PsychoH13
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Commits on Dec 16, 2011

Commits on Apr 22, 2012

Typing correction for weak references.
PsychoH13
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Commits on Apr 23, 2012

Pulled Mike Ash's repository into the fork.
PsychoH13
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Commits on May 16, 2012

Corrected macros.
PsychoH13
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Commits on Aug 1, 2013

Remove the shadow diagnostic around the variable redefinition.
PsychoH13
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