Allow specifying an optional name for import-fn and import-macro

[dakrone]

I apologize for the whitespace cleanup in this, if it bothers you I can try to do the PR without it.

Adds the ability to specify an optional name for importing something with import-fn and import-macro. Which allows using import-* for aliasing.

[ztellman]

I use a weird indenting scheme (two spaces everywhere), it doesn't bother me, but it will naturally return to its previous state once I touch the file again.

This looks good, but I was just about to switch this over to the MIT license, so that it's easier for people to cut-and-paste stuff from here if they don't want it as a dependency. Do you mind if I swap that out from underneath you before merging your code?

[dakrone]

Go for it, that sounds good to me.