Merge pull request #19 from ecaldwell/master

enhanced getUsers function
Update arcgis.com to www.arcgis.com
addNewUsersToGroups.py throwing error

error in user list being sent to admin.py. ERROR; throwing expecting
string getting dict. Also admin.py had wrong key (groupid) in
addUsersToGroup toolSummary.append should be group
Merge pull request #21 from pwilkebrown/samples

addNewUsersToGroups.py throwing error