[Truffle] - A Symbol literal is the same object when created from identical strings
[Truffle] - Fixing indentation in RubySymbol class.
[Truffle] - Refactoring RubySymbol.SymbolTable to use ConcurrentHashMap instead of an array.
Merge pull request #1464 from lucasallan/symbols-table

[Truffle] - A Symbol literal is the same object when created from identical strings