v0.1.5

Sorry for skipping internal versions, I am sure not much is lost until the package starts to get more traction.

The most interesting thing I added this time is the ability to execute python code using the execute() function. It works just like exec() with all it's caveats, but before running the coded, uses the ast module to resolve sigils in the strings inside the code. If anyone can suggest safer alternatives to exec, I am open to suggestions, please open an Issue.

Thanks!!