Multithreading Concurrency Violation Fix while merge #83
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What's in this pull request?
With the new stack model we are now merging the context changes across main and background contexts via notification. But this merge results in concurrency violation. This PR fixes that issue by issuing the merge in the context's
performBlock
Updated the Example project to use a background context(on trashing all company data objects) linked to parent background context to cover all bases.