Avoid backslashes where possible.
Avoid backslashes where possible.

In some cases, Opal can insert a literal backslash into the generated
JavaScript, resulting in a syntax error.  Help it out in a few cases in
spec/jwt_spec.rb.

Signed-off-by: brian m. carlson <738bdd359be778fee9f0fc4e2934ad72f436ceda@crustytoothpaste.net>

bk2204/daniel-ruby,bk2204/daniel-ruby