Update version number to 0.8.11
Update dependencies
Fixed account clear wiping out cred store
Merge pull request #1413 from christav/release-0.8.11

Version update, fixes to dependency versions, test tweaks.
Test runs no longer delete credentials.

Also consolidated the three different but otherwise identical
credential store tests into a single file that tests all three
options (if the tests can run, that is).
Merge pull request #1414 from christav/fix-credential-deletion

Test runs no longer delete credentials.
update change log
fix tabing
Merge pull request #1417 from yugangw-msft/release-0.8.11

update change log
Merge pull request #1418 from Azure/release-0.8.11

Release 0.8.11
Merge pull request #1419 from Azure/master

Merge from master to dev