Sort imports from all files

Add "prettier" script in `package.json` to check if all files are
compliant.

Sort all imports and format all files by running `npm run lint -- --fix`
followed by `npm run prettier -- --write`.

Gitlab #29

Change-Id: Id80402d1344c3bc611f66a46cffeee5f2c375bd8
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..9483a19
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,4 @@
+daemon/
+dist/
+node_modules/
+test/