Don't require spaces inside expression parentheses

[gibson042]

Excluding spaces from inside expression parentheses, especially in loop-statement assignments, has historically been common in jQuery—and used intentionally to visually distinguish expression parentheses from statement parentheses—but was prohibited by jscs-dev/node-jscs@0f78baf in response to #104 (which was removing our complicated function-call exceptions).

Since that time, JSCS has added an ignoreParenthesizedExpression option to requireSpacesInsideParentheses. We should adopt it and update the style guide accordingly.

[kborchers]

👍 for what it's worth from someone who rarely gets to write code anymore 😄

[dmethvin]

I'm strongly for this as well.