Added some basic tests for `Option::unzip()` and `Option::zip()` (I noticed that zip had no tests)
Added some basic tests for `Option::unzip()` and `Option::zip()` (I noticed that zip had no tests)

graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust