Updated adal use so that multiple add-azureaccount calls show the login window
Initial version of token cache
Merge branch 'dev' into adal-token-cache
Merge branch 'dev' into adal-token-cache
Fixed round tripping of datetime, null strings
Applying code review feedback
Using an explicit tokenizer for cache key, naieve approach had edge condition issues.
Merge pull request #1932 from christav/adal-token-cache

Adal token cache