Modified method signatures to use ProfileRequest and ProfileResponse.

Modified method signatures to use ProfileRequest and ProfileResponse.
Added ShibbolethProfileRequest and ShibbolethProfileResponse implementatations of new interfaces.
Added ProfileResponseContext for passing around all those bits of data you need when creating a SAML response.
Cleaned up saml2 attribute query.
Ran eclipse formatting on files as I went.
Stiil not clear which pieces will fall out into the AbstractProfileHandler class.

git-svn-id: https://subversion.switch.ch/svn/shibboleth/java-idp/trunk@2169 ab3bd59b-922f-494d-bb5f-6f0a3c29deca