v0.15.0

Features

• saml11: adds saml11.createUnsignedAssertion() (51170c9)
• saml20: adds Saml20.createUnsignedAssertion() (de0e766)
• xml/sign: unsigned assertions should have whitespace removed as well (968d0e7)

Bug Fixes

• saml20: parses saml20.template only once at start up (cb3bfcd)