Compiler was writing new content to files on paths that wasn't findable by the compressor. Fixes #228

I simply removed the usage of finders.find() to find already created files and let the compiler always use the fallback on building an output-path based on the input-path. The outdated check if is now always done by comparing time modified.

I didn't manage to write any good test cases for this due to the bug being quite complicated to reproduce.

See #228