Releasing 1.27
Bumping to next rev
[JENKINS-25945] Fixed documentation according to the implemented method
in ReleaseContext.groovy.
added release notes entry
Add support for the `credentials-binding` plugin

Add support for the [Credentials Binding Plugin](https://wiki.jenkins-ci.org/display/JENKINS/Credentials+Binding+Plugin).
cleanup
Merge branch 'credbind'
Enhanced rudimentary support for custom config files

Enhanced support of [Config File Provider Plugin](https://wiki.jenkins-
ci.org/display/JENKINS/Config+File+Provider+Plugin) to enable custom
config files for build jobs.

```groovy
job {
    wrapper {
        configFile {
            fileName 'myCustomConfigFile'
        }
    }
}

```
cleanup, allow to add multiple files
Merge branch 'config-file'
Add support for the `http_request` plugin

Add support for the [HTTP Request Plugin](https://wiki.jenkins-ci.org/display/JENKINS/HTTP+Request+Plugin).
Add an additional method signature for `httpRequest`
cleanup, added parameter validation for httpMode
Merge branch 'httpreq'
removed usages of def

Part of the effort to cleanup DSL method signatures, see https://groups.google.com/forum/#!topic/job-dsl-plugin/2-iuHl4tidI. All usages of def will be removed to be able to activate the NoDef CodeNarc rule.
removed usages of def, moved some tests which did not test behaviour of WithXmlAction to a new test spec

Part of the effort to cleanup DSL method signatures, see https://groups.go
replaced usages of def by Object

Part of the effort to cleanup DSL method signatures, see https://groups.go
suppress warnings for certain usages of def

Part of the effort to cleanup DSL method signatures, see https://groups.go
activate NoDef CodeNarc rule

Part of the effort to cleanup DSL method signatures, see https://groups.go
added release notes entry