Merge branch 'exp_surround1'

Makefile.am

celt/arch.h

celt/celt.h

celt/celt_encoder.c

celt/fixed_generic.h

src/analysis.c

src/analysis.h

src/mlp.c

src/mlp.h

src/opus_encoder.c

src/opus_multistream_encoder.c

src/opus_private.h

src/tansig_table.h