limit the roleShow string to 2 roles and then add ellipsis

Change-Id: Id427be292d1a187b22cfaadd5b43c2424f0e9c84
role and member changes now interact with hidden form, so the data get persisted when form is submitted

added getRoleMembers method to be able to call update_role_lists after adding or removing group from member's group list

Change-Id: Ifd463a04db268aef0f4efd13c6a7ec87c82e3f4a
Merge pull request #6 from jtomasek/angular_membership

Role and member changes now linked with hidden form