Move some things around in Misc. Functions
Move some things around in Misc. Functions

1. Remove "String functions", just add them to "Misc. Functions"
   header
2. Rewrote Fiesta.contains to use that weird ~ operator (thanks to
   https://github.com/jed/140bytes/wiki/Byte-saving-techniques)
3. Fiesta.contains works with strings and arrays, but it didn't ever
   say so. Now the comment says that.

EvanHahn/Fiesta.js