Remove the part in the readme about consistency as a symbol
Clarify that prepared statements should be prepared only once

[ci skip]
The batch docs in the readme introduced new concepts, move them

It makes more sense to introduce the :consistency option in one place for regular, prepared and batch statements.

Tracing will get it's own section, too.

[ci skip]
Add a readme section on tracing
Clarify the 9160 issue in the readme

[ci skip]
Make a tiny wording change in the readme

[ci skip]
Version bump to v2.0.0
Change to rbx-2, the Rubinius alias du jour

This changes way too frequently
Remove an unecessary env in Travis matrix/include
Optimize CqlProtocolHandler#next_channel_id

Up to twice as fast.
Change from Mutex#synchronize to #lock/#unlock in hot paths
Add LZ4 compression support

Broken because lz4-ruby doesn't handle multi-byte characters
Update to lz4-ruby 0.3.2

This one supports multibyte characters
Generalize the compression integration tests and add one for LZ4
Update the docs to say that lz4-ruby 0.3.2 is required
Add info about LZ4 to the readme

[ci skip]
Optimize the LZ4 compressor by constanticizing strings

It's not a big optimization, but it's something
Make sure the integration tests actually use LZ4…
Add test and support for compressing and decompressing byte buffers