retire Symbols
simplify QuotationValidator constructors
override doesn't need to be public
SymbolTable#setLang is unused
make Symbole immutable
retire ConfigurationBuilder#addInvalidPattern(). With this method, Symbols defined in DEFAULT_SYMBOLS / JAPANESE_SYMBOLS get dirty.
migrate type of invalidChars from List<String> to char[]
Merge pull request #333 from recruit-tech/symbols-refactor

retire Symbols simplify QuotationValidator constructors