Change How Binary Cache Works

[briandowns]

The current implementation uses the URL in the request as the cache key. This prevents calls to the functions in the same repo from being executed since the binary cache will only contain a binary for the vert first function called.

There are a number of ways to resolve this.

• Append the function name to the repo and use that as the cache key
• Create a hash of the 2 strings and use the case
• ?

[briandowns]

Resolved via #20