update podspec and project settings

fixes for release:

1) remove JSONTransformers missing references `StringToNSURL` and `StringToNSDate`
2) add test from `develop2` branch for array of JSONEncodable initializer extension

Merge branch 'release/2.1'

Fixed tests

Merge branch 'release/2.0'

# Conflicts:
#	JSONCodable.podspec

Updated podspec

Added support for nested decoding

Fixed import