handle with fizz buzz problem

[JunNishimura]

• add test for and, or, mod command in lexer (add testdata for fizz_buzz #59)
• refactor lexer (add testdata for fizz_buzz #59)
• add test for and, or, mod command in parser (add testdata for fizz_buzz #59)
• add builtin method for and, or, mod operation (add testdata for fizz_buzz #59)
• add test for and, or, mod command in eval (add testdata for fizz_buzz #59)
• add unit test for embedded ident in string (embed identifiers to string literal #60)
• handle with embedded idents in string (embed identifiers to string literal #60)
• fix equal builtin function (add testdata for fizz_buzz #59)
• fix evalEmbeddedIdentifiers (add testdata for fizz_buzz #59)
• add examples for fizz buzz (add testdata for fizz_buzz #59)