INTSAMPLES-137: Add WebSockets sample

JIRA: https://jira.spring.io/browse/INTSAMPLES-137

Depends on https://github.com/spring-projects/spring-integration/pull/1274

Polishing and cleanup

* Fix `cafe-dsl` project: https://build.spring.io/browse/INTSAMPLES-NIGHTLY-JOB1-1131
* Change author emails to the `pivotal.io`
* Regenerate poms

Fix for `Cafe-DSL` sample

https://build.spring.io/browse/INTSAMPLES-NIGHTLY-JOB1-1143
INTS-137: Add STOMP Chat Application

JIRA: https://jira.spring.io/browse/INTSAMPLES-137

* Upgrade to Boot 1.1.7
* Fix several Boot apps to get deal with `args`, e.g. `--debug` option can be useful for Boot
* Provide a loca copy for JavaScript files (`sock.js` and `stomp.js`) to avoid extra Internet connection on testing

INTS-137-2: Make JavaScript cross-browser

Some additional polishing to the server config, like `logging-channel-adapter` for server message flow
INTSAMPLES-138: Make SI 4.1 as minimal

JIRA: https://jira.spring.io/browse/INTSAMPLES-138

* Upgrade to Boot 1.2, which is based on the SI 4.1
* Upgrade to SF 4.1.1
* Fix `feed` sample to use new `Rome` dep. from SI
* Fix deprecations for `@Payload`, `@Header` etc.
* Fix mongo` sample deprecation warn
Update README for Versions
Upgrade to SI Java DSL 1.0.RC1 and Gradle 1.12

Regenerate POMs