Merge pull request #9 from stleon/send_file

accept image like binary

Stable release

- upd chatweb + no public channel
- make tar
- write logs to file
- upd chatweb
- vm.args.devel
- prod release in Makefile
- minimum otp version -- 19.2.1
- upd bert.erl
- get domain for cookie from env

upd chatweb + no public channel

bert utf8 string

ignore incoming messages when no receiver in room