allow the authenticate method to return a result
make the sample app actually work in the default config
authenticate like it is 1994 all over
add SPNEGO authentication
Merge branch 'www-auth' of github.com:fhars/play-authenticate into fhars-www-auth

Conflicts:
	samples/java/play-authenticate-usage/README.md
	samples/java/play-authenticate-usage/conf/play.plugins
Merge branch 'fhars-www-auth'
Switch to non-deprecated class
Add icon for basic Auth
Update signature for Play 2.3
Only show basic auth hint if there is basic auth available
Add basic auth to README
Update github icon