Update `requirePaddingNewlinesBeforeKeywords` rule

[ruiquelhas]

Resolves #4.

[nunofgs]

I think we should try to get this fixed in JSCS rather than disable it. Otherwise, if we merge this, then this will be considered valid:

function one() {
}
function two() {
}

When, in fact, we want a newline before each function.

[ruiquelhas]

Actually, in this specific case, I guess because we have requirePaddingNewLinesAfterBlocks, that code snippet will be invalid.

[ruipenso]

@ruiquelhas Please rebase.