Fix build, lint, and test issues

[mdmower]

• Fix build error introduced by PR #56 - missing closing parentheses
• Fix lint errors introduced by PR #56 - if/else braces
• Fall back to CWD if sublime theme dir not found
• Fix sublime util tests since existSync was introduced in PR #56
• Minor formatting cleanup

[mdmower]

@tobiastimm - this is ready for review.