Release 0.9.4

Release 0.9.4

* Fix critical bugs in tokenization algorithm
* Write unit tests for tokenization
* Add documentation for lua_tcp
* Switch off legacy tokenization by default.
* Fix critical bugs in words normalization
* Add lua bindings to tokenizer.
* Implement storing of HTTP headers inside task
* Add lua API to accerss HTTP headers data
* Implemented base64 encoding suitable for MIME
* Use caseless hash and equal functions for HTTP request headers.
* Improve debian architectures support (by @dottedmag)

Signed-off-by: Vsevolod Stakhov <vsevolod@highsecure.ru>