Remove support for @SecondaryKey annotation

Multiple primary keys for a single entity isn't something
that can be scaled on top of a database like BigTable or
Cassandra.  Remove support for it, forcing the application
to implement its own secondary key approach that fits its
database model.

Change-Id: I3dcf08336ff3563321367516cd72c04c3bb5f37a
Signed-off-by: Shawn O. Pearce <sop@google.com>
6 files changed