ArrayAccess, IteratorAggregate, Arrayable, Jsonable on Collections #19
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Resolves #15.
Also, spatial Types class hierarchy is now cleaner/closer to MySQL's; from:
![screen shot 2017-09-24 at 9 03 44 pm](https://user-images.githubusercontent.com/1837678/30788602-9f15570c-a16c-11e7-8e67-33372e850f2e.png)
![screen shot 2017-09-24 at 9 08 27 pm](https://user-images.githubusercontent.com/1837678/30788608-a5afd894-a16c-11e7-9a51-0a08b331d4c4.png)
to: