[foxylad]

Yes, but the Electric Imp has wifi built in for $30.

Ironically it uses the Squirrel language to program it, which I think was a mistake - I found it very unproductive.

[Zuph]

They were using Lua, but found some of the features of the language to be non-condusive to microcontroller use.

If you want something similar that can be programmed bare-metal, check out the spark core: https://www.spark.io/