Always check whitespace around FunctionExpressionOpeningBrace. Fixes #64

This removes half the exception of FunctionExpression inside CallExpression.
While it's intended as a bugfix, it also changes a few unrelated tests to
match that style. This looks like a better default, matching what jQuery does,
and afaik not contradicting anything in the Google JS Style Guide.
Merge pull request #65 from jzaefferer/iss-64

Always check whitespace around FunctionExpressionOpeningBrace.