Merge pull request #1 from Esri/master

Merge pull request #8 from oevans/master
Update .gitignore - add .DS_Store (invisible Mac file)
Added migrateAccount function and example and other minor changes

Better comments for Add New Users To Groups example and Date Created
field to User Report example.
Added migrateAccounts function and usage example
Update README: added migrateAccount(s) functions to Features
minor formatting in readme