Signify language of code examples in README.
Put code samples in the correct language blocks.
Revert "Put code samples in the correct language blocks."

This reverts commit 05e872ce1b444c13f404a4f46c70104cfa41b1c3.
Update example to use new Nimble matcher syntax.
Merge pull request #110 from paulyoung/signify-language-in-code-examples

Signify language of code examples in README.