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Concat string with (functions and lists) enhancement (#70)

* Implemented hoisting

Implemented hoisting for ```let```, ```const``` and function declarations according to es6 spec (Except that redeclaration of functions is disallowed here unlike in es6).

* Proper for loop behaviour implemented according to es2015 spec if needed.

- Each iteration block will have its own closure of the loop variables
- But updating of loop variables within the iteration block will still update the original loop variables

* Proper for loop behaviour implemented according to es2015 spec if needed.

- Each iteration block will have its own closure of the loop variables
- But updating of loop variables within the iteration block will still update the original loop variables
- Updated block scoping tests

* Removed accidentally committed items.

* Used Source ```toString``` method instead of native ```toString``` during ```BinaryExpression```.

Should resolve #69 and #56

* revert for loop scoping

* simplified toString, and only checks types during "+" operation.

* Removed blank lines

* Removed blank lines

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