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Fix functions equality (#92)

* 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).

* Removed accidentally committed items.

* Changed hoisting to only hoist the identifiers of `let`, `const`, and function declarations and not their assignments.

* Fixed multidimensional arrays.

* revert test

* Fixed issue where functions passed to non-source functions turn out to be not equal to the original.

* Fix printing of functions (aka closures) (resolves #119)

* minor text fixes and removed reliance on external non-source builtins

* export defineSymbol

* used defineSymbol instead of hardcoding

* import defineSymbol

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