Add ssv.blank method

[ryanve]

Simple method for sweeter code

[ryanve]

examples

ssv.blank("travis") // false
ssv.blank("      ") // true
ssv.blank("") // true

[ryanve]

ssv.blank(string) equals !ssv.count(string)

Use whichever vibes best with your code

blank is faster

[ryanve]

Java strings have a blank method called isBlank that works the same

Returns true if the string is empty or contains only white space codepoints, otherwise false.