fixed back button
clear users/admins arrays before resetting them - prevent filling the array with duplicate user/admins
deleted adding users/admins in toObject function
moved setAdmins/setUsers declaration into toObject function
merge from master.
updated the back button code to put them closer to each other.
update the link url to depend on ui-router rather than hardcode it.
Merge branch 'master' of github.com:Transformapp/webapp into feature-back-button
Merge pull request #24 from Transformapp/feature-back-button

fixed back button
Merge branch 'master' of github.com:Transformapp/webapp into group-details
only set it in service call, rather in toObject()
Merge pull request #25 from Transformapp/group-details

Group details bug fix (displaying duplicate users/admins)