refresh_session, silent token request, sync call
update callback onError to return authenticationException, update integration tests for acquiretokensilent
refresh_session test update
update test app to add refresh session
acquireTokenSilent negative test, update exception handling, update onError call for sync
Merge branch 'dev' into dev_refresh_session
store cache with/without userid to allow methods that does not have loginhint
Update hello app to test resource overwrite
Fix issue for goback
update yes/no string to resources instead of android system string
change encoding in test app
Return inner exception in sync call
update readme for acquireTokenSilent
update version, readme file for information about acquireTokenSilent, fix exception handling
Merge pull request #195 from MSOpenTech/dev_broker

Broker related changes
resolve merge conflict
fix userid check in cache
Merge pull request #193 from MSOpenTech/dev_refresh_session

Force refresh session
merge dev and account for blank page for back button
sample app update
Merge pull request #197 from MSOpenTech/fix_back_button

fix back button and confirmation related resources