Swift Cookbook Updated to Swift 3.0 Syntax

I updated my online Swift Cookbook to the 3.0 syntax.

Here are the current topics:

• Arrays
• Color
• Date and Time
• Dictionary
• Sets
• Strings

I also added a Github repo where all the sections are in one playground. In the near future, I hope to add sections for web, regular expressions, and files. Let me know if there are any other topics that interest you.