update golang-jwt

initial experiment with testify assertions

Oops, needed a cleaner history

Reduce amount of be_string public api. `Only(Alpha|Numeric|Whitespace…

…|etc)` is now a generic Only*** matcher

Reduce amount of be_string public api. `Only(Alpha|Numeric|Whitespace…

…|etc)` is now a generic Only*** matcher

updates

be_strings.Titled() upgrade from strings.Title() to cases. Support la…

…nguages