added protocol buffer language support
added booleans to protobuf language definition
changed heading in test.html from "Protobuf" to "Protocol Buffers"
changed class for protobuf enum values from "title" to "constant"
added self to authors file
moved protobuf boolean values into keywords section
Adding Dan Tao to AUTHORS.ru.txt
Highlight the beginning keyword and the title in the class definition in Protobuf.
Merge branch 'master' of github.com:isagalaev/highlight.js