Solve eslint warnings; use webpack alias.

[myst729]

• Solve eslint warnings for double quotes in nightwatch config file.
• Use webpack alias src over relative path in unit test entry file.

[LinusBorg]

removing double quotes is fine, but why add quotes to keys that don't need any? which eslint rule/preset does require this?

[myst729]

Oops, my bad. It was a batch find-replace, updated to keep only necessary quotes.

[LinusBorg]

Thanks!