fix logstreamer init file_match config
add issue to CHANGES.txt
Remove heka-docs link.
Merge pull request #893 from vincentzhwg/dev

fix logstreamer init file_match config
MultiDecoder improvements: Don't require nested sub-decoder config,
don't recycle packs unnecessarily, don't skip a decoder entirely if one
of a set fails to decode, don't hang if SandboxDecoder subdecoder
fails during initialization.
Got rid of unnecessary Decoders map, renamed Ordered slice to
Decoders.
Merge pull request #901 from mozilla-services/multidecoder-improvements

MultiDecoder improvements
Merge remote-tracking branch 'upstream/dev' into protobufencoder_include_header
Fixed amqp_test and tcp_output_test to properly setup the default configuration of ProtobufEncoder.