Move UserPrincipalsHelper to nexus-core (from restlet plugin)
Merge branch 'master' into adapt-usertoken-authenticate
Use Preconditions from guava
drop unused import
deprecate appcontext Preconditions impl to hopefuly help keep it from creeping into use
kill pointless constants class
Move core security filters from restlet1x plugin to nexus-web-utils
drop unused test muck
Simplify RemoteIPFinder since its now split, port over tests.
Deprecate CallbackRef, this should not be used anymore
experimental: testing use of instance binding
Revert "experimental: testing use of instance binding"

This reverts commit 537d42fcf3ea5288763f6f5056b1b510385c0abc.
drop comments, defer is required until this can be refactored further
Merge branch 'master' into adapt-usertoken-authenticate
Merge pull request #204 from sonatype/adapt-usertoken-authenticate

REVIEW: Adapt usertoken authenticate