Revert "Remove objc attributes from NMBExpectation"
Revert "Remove objc attributes from NMBExpectation"

This reverts commit 6340919a1b08c7ad96c478f176ff42ca73217422.

twobitlabs/Nimble,AnthonyMDev/Nimble,twobitlabs/Nimble,AnthonyMDev/Nimble,abbeycode/Nimble,phatblat/Nimble,abbeycode/Nimble,Quick/Nimble,DanielAsher/Nimble,Quick/Nimble,DanielAsher/Nimble,AnthonyMDev/Nimble,twobitlabs/Nimble,phatblat/Nimble,Quick/Nimble,DanielAsher/Nimble,abbeycode/Nimble,phatblat/Nimble,abbeycode/Nimble