Attempt to set X-Frame-Options: SAMEORIGIN on every response
Merge remote-tracking branch 'origin/master' into NEXUS-6569-add-x-frame-options
NEXUS-6569: Fixing ITs use of equal method

Using Matchers.equalTo for that
NEXUS-6569: CommonHeadersFilter applies std headers before passing on

To ensure that headers are always added. See issue comments
(Stuart's and Chris' comments)
NEXUS-6569: Typo in UT
[NEXUS-6569] Add X-Content-Options header
Merge pull request #525 from sonatype/NEXUS-6569-add-x-frame-options

NEXUS-6569: Add X-Frame-Options standard header