Wrap `if` statement with braces
Use `!==` and `===` instead of `!=` and `==`
Use hexadecimal escapes instead of octal escapes

Octal escapes have been deprecated in ES5 and they produce syntax errors
in strict mode.

See https://mathiasbynens.be/notes/javascript-escapes#octal.
Merge pull request #85 from yous/patch-jslint

Resolve issues with JSLint