Add support for array destructuring

[czosel]

I finally dared (and found the time) to take a closer look at the parser 😄 I'm curious to hear your feedback!

Fixes #121

[coveralls]

Coverage remained the same at 94.772% when pulling 607708c on czosel:array-destructuring into 82233e9 on glayzzle:master.

[ichiriac]

Hi @czosel,

I've read carefully your changes, and the algorithm is perfect 💯

I only need to make a small change, I need that array deferencing behaves as list, so I'll use the same node in order to make it more easier to handle nodes translations for example (and keep a property for the semantics part)

Again, many thanks for your help

[czosel]

☺️ great! Thanks for the review and the merge - I’ll take a look at your changes concerning the list node.