1.4.0

Changes:

• Removed FileKit dependency (using own and optimized copy of TextFile class)
• Internal Swift 3 optimizations (including making CSVImporter non-subclassable with public)
• Added support for specifying the encoding for the CSV file to import (was always UTF8 before):

Example usage:

let importer = CSVImporter<[String: String]>(url: url, encoding: .utf16LittleEndian)

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Thanks to @dkalinai for helping to fix #12.