Replaced abuse of the logical or operator

[Azeirah]

Statements like

function someFunc(x) {
    x = x || 1;
    return x;
}

Can fail unexpectedly, as for example 0 is falsy, someFunc(0) returns 1.

I was playing around with spectra, diminishing alpha values over time.. When alpha reached 0, alpha was suddenly 1, fully opaque!

var c = Spectra({r: 0, g: 0, b: 0, a: 0}).rgbaString()

Should be rgba(0, 0, 0, 0), but is rgba(0, 0, 0, 1) instead!

This has been fixed in this pull request.

[coveralls]

Coverage remained the same at 99.259% when pulling bf449ca on Azeirah:master into 13fa41d on avp:master.

[Azeirah]

Thanks for taking the time to merging this request, not all package maintainers take the time to manage their projects after development has stalled.