Enhancement/use custom polymer root
This makes sure that POLYMER can be imported if the user provides the POLYMER root directory, even if it s not installed as a package.
Fixes enpt_enmapboxapp#34 (closed).
This makes sure that POLYMER can be imported if the user provides the POLYMER root directory, even if it s not installed as a package.
Fixes enpt_enmapboxapp#34 (closed).