release : v3.1.2

ci/cd : v3.1.1

fix : important bugs on App-Token areas

Merge branch 'v3-preparation'

fix : wrong docker image, use this if you'd like to use zero-downtime…

… docker deployment 'https://github.com/patternknife/docker-blue-green-runner'

fix : make @PreAuthorize throwing exceptions clear and add it to test…

… codes

feature : Create more selective pointcuts (refer to README)

feature : can customize the knife error payload

ci/cd : the first publish

ci/cd : add a test code for grant_type missing and correct the payloa…

…d consistency