Feature: include alpha in Hex

[Itta Funahashi]

Modern browsers allow to contain alpha values in Hex. (Ex. rgba(0, 0, 0, 0.5) = #00000080)
However,

tinycolor('rgba(0, 0, 0, 0.3)').toHex()

will be #000000.

[Sergiu Cazac]

There is a toHex8 for that already.

[Itta Funahashi]

thanks.