Fix issue#233

Fix
https://github.com/AzureAD/azure-activedirectory-library-for-objc/issues
/233
Fix Issue#229

Fix for
https://github.com/AzureAD/azure-activedirectory-library-for-objc/issues
/229
updated release information and changelog

updated release information and changelog
Merge pull request #234 from AzureAD/pkeyauth_flag_fix

Pkeyauth flag fix to master