Improvement/performance tweaks [WIP]#54

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swistakm wants to merge 4 commits intomasterfrom

improvement/performance-tweaks

Commits on Apr 11, 2017

serializers: redesigned validation and star-like writable fields
swistakm
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Commits on Apr 12, 2017

docs: remove obsolete code and comments from serializers examples
swistakm
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serializers and fields: improve test for custom instance factories and clarify terminology
swistakm
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Commits on Apr 17, 2017

serializers: improve serialization time by caching fields items
swistakm
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