Fix for Issue#123

Fix for Issue#123
https://github.com/AzureAD/azure-activedirectory-library-for-objc/issues
/123
build fix
Merge pull request #160 from AzureAD/osx-pkeyauth-merge

Osx pkeyauth merge
fix for issue#164

fix for issue#164
Merge pull request #165 from AzureAD/osx-pkeyauth-merge

fix for issue#164
made OSX and iOS object retrieval same
Merge pull request #167 from AzureAD/osx-pkeyauth-merge

made OSX and iOS object retrieval same
Fix for Issue#168

fix for
https://github.com/AzureAD/azure-activedirectory-library-for-objc/issues
/168
disable pkeyauth in OSX
fix for issue#168
fix for #168
Merge pull request #169 from AzureAD/osx-pkeyauth-merge

Osx pkeyauth merge
test fix
Merge pull request #172 from AzureAD/osx-pkeyauth-merge

test fix
Merge