add library config

[skoppe]

Right now having optional as a dub dependency causes it to build the unittest configuration.

This is because the unittest config is the first in the dub.json, and when you don't specify a configuration for a dependency dub just picks the first.

If I change my compiler's configuration file (dmd.conf or ldc2.conf) and add -betterC (because I want to enforce betterC on my dependencies), the build fails because the ./tests contains files which are not betterC compatible.

By adding this library configuration the ./tests files are no longer included in the compile.

[aliak00]

Awesome! Thanks for this. Question: There's a dependency on silly that you've left in. Will that cause other projects to get silly as well if built as a library? Maybe remove that then?

[skoppe]

You are right. I removed it.