ParsleyItemClassLoader helper for Scrapy
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Fixed extraction tree for optional keys

Added ParsleyImplicitItemClassLoader for automatic Scrapy
Item class creation and Items output, and Request generator
(still pretty rough)
Merge branch 'scrapyutils' of github.com:redapple/parslepy into scrapyutils
Merge branch 'master' of github.com:redapple/parslepy