NPM project-level configuration file

Added the NPM `.npmrc` (1) configuration file to ensure specific
configurations are set project-wide for all core team members and
contributors. This includes the usage of the lockfile
(`package-lock.json`) (2) and exact (dev)dependency package versions.

References:
  (1) https://docs.npmjs.com/files/npmrc
  (2) https://docs.npmjs.com/files/package-locks

Epic: GH-33
Depends on GH-49
Blocks GH-36 GH-37 GH-44 GH-45
Resolves GH-47

.npmrc

@@ -0,0 +1,8 @@
+; Copyright (C) 2017-present Arctic Ice Studio <development@arcticicestudio.com>
+; Copyright (C) 2017-present Sven Greb <development@svengreb.de>
+;
+; Project:    snowsaw
+; Repository: https://github.com/arcticicestudio/snowsaw
+; License:    MIT
+package-lock=true
+save-exact=true