added idea about how to count distance
spark fixes for python3
removed old list of filetypes
added library support for alphabets
added grammar example files from several python tools
added parsley and pymeta examples
fixed bug in translator binary
added pyparsing support as a translator
fixed search test
fixed tests
removed output from translators
added pyparsing
improved error message
refactored AlphabetDictLexer

added better support for multiple alternatives. I haven't implemented
backtracing though
removed AlphabetDictDefinition and checker

It was nearly the same than AlphabetListDefinition
removed unknowngrammar from lexer
removed first checking in Lexer
implemented backtracing lexer
refactored lexing tests
fixed jsonschema test

by commenting faulty code