FLUME-1949. Documentation for sink processor lists incorrect default.

(Juhani Connolly via Mike Percy)
FLUME-1911. Add deprecation back to the legacy thrift code.

(Hari Shreedharan via Mike Percy)
FLUME-1882. Allow case-insensitive deserializer value for SpoolDirectorySource.

(Will McQueen via Mike Percy)
FLUME-1511. Scribe-source doesn't handle zero message request correctly.

(Denny Ye via Mike Percy)