Reviewed-by: darcy, lancea, alanb, briangoetz, mduigou, mchung

Summary: Add words in more places to make it clear that Logger objects are GC'able unless there is a strong reference.
Reviewed-by: dholmes, andrew

Summary: Use ReferenceQueues to manage WeakReferences in LogManager and Logger.
Reviewed-by: dholmes, alanb, emcmanus, tonyp
Contributed-by: jeremymanson@google.com

Reviewed-by: darcy, weijun

Summary: Fix typos, some grammar and some inconsistencies in phrasing.
Reviewed-by: tbell

Reviewed-by: swamyv
Contributed-by: jeremymanson@google.com

Reviewed-by: swamyv
Contributed-by: jeremymanson@google.com