Perform group lookups by name from the group index

Now that we have the group index, we can use it to look up groups by
name. This change is a prerequisite for migrating groups to NoteDb.

Change-Id: Iaa60ae8515987278b62b4a89415266726bd77644
7 files changed
tree: a9ce161da29ec299a4ccb84d728899f9b082b6a7
  1. .gitignore
  2. .settings/
  3. BUILD
  5. src/