Based on Mark Adler's review comments.

Some wording changes to Section 2 of the spec.

Add the current version of the brotli specification.

Add the .nroff source file and a python script to generate
the .txt version (requires the nroff command).

Limit the max input meta-block size to 16MB.

Proof-of-concept encoder for parallel compression.

Add a version of the brotli encoder that compresses
each meta-block independently, only using the
original input data from previous meta-blocks
and nothing from the compressor state.
This is a proof-of-concept to show that the
current format is flexible enough to support
parallel multi-threaded compression.

Add an input block size parameter to brotli.

This will enable processing the input in smaller
chunks than the currently default 2MB for the
slow brotli, while still benefiting from the
larger sliding window.

Update the previous two bytes when decoding an uncompressed metablock.

uncompressed metablock.

Add a missing state transition to CopyUncompressedBlockToOutput().

Faster decoder for data with trivial context maps.

This makes it 20% faster when decoding data with
trivial context map (where the histogram type
depends only on the block type and not the
context).

Add quality and lgwin to the BrotliParams.

Remove the hard-coded constants for window size
and meta-block size.

Initialize internal storage for each metablock
separately and reserve only as much as needed
for the actual input.

[python] moved setup.py to the root of repository

bugfixes affecting streaming decoding

Use FastLog2() instead of log() in BitsEntropy().

Add some missing state transitions to DecodeContextMap().

Update the states in DecodeContextMap to the next one,
else it would continue at the wrong spot if exactly there
the partial input is split.

[python] add test command to setup.py

Fixing building Python module after 534654de

Add a faster but less dense compression mode.

The new mode can be used by setting the greedy_block_split
field of BrotliParams to true.

This commit moves all the meta-block processing code
into its own library and moves the meta-block encoding
code to brotli_bit_stream.cc from encode.cc

Change the return value of decoder functions from integer codes to an enum.

Propagate error condition from ReadHuffmanCodeLengths()

Remove the redundant EncodeMetaBlockLength() function.

Use Store{Compressed,Uncompressed}MetaBlockHeader() instead.

[python] fix calling python script as subprocess on Windows