I've been experimenting for a while with a new brotli compressor.
Instead of being a translation of the C implementation,
it's a rewrite in Go, with a modular structure thanks to interfaces.
(A few low-level functions still come from the C version, though.)
The performance is getting to the point where it seems to be worth
adding to the brotli repository.
This reverts commit c3da72aa01.
With the sample data from issue 22, one byte in the output file is zero
instead of the correct value. For now at least, we'll go back to the old
way of writing bits.
Fixes#22