Polish
Document @ConfigurationProperties on @Bean methods

Minor javadoc edits to hint that @ConfigurationProperties can also be
used with @Bean methods.

Fixes gh-1330
Add option to disable `X-Application-Context`

Add `management.add-application-context-header` option to disable
the automatic adding of the `X-Application-Context` HTTP header.

Fixes gh-1308
Merge branch '1.1.x'