Use REST Api for submitting review

Parse message from old style command and get
review values from ParameterExpander.

GSON and Apache HTTPClient handle json conversion and
submitting of json.

The selection of review submitting method is done in
global configuration.
Store password as a secret.
Add button for testing http rest connection

Use project listing for testing and check only for status code.
Use all allowing authscope

ssh hostname migth not be the hostname of Gerrit front end.
Add License and copyright headers to new files.
Move message getters to ParameterExpander.

ParameterExpander handles other message related methods,
so it seems to be better plave.
Merge branch 'json' of https://github.com/jyrkiput/gerrit-trigger-plugin

Conflicts:
	gerrithudsontrigger/src/main/java/com/sonyericsson/hudson/plugins/gerrit/trigger/GerritManagement.java
	gerrithudsontrigger/src/main/java/com/sonyericsson/hudson/plugins/gerrit/trigger/gerritnotifier/NotificationFactory.java
	gerrithudsontrigger/src/main/resources/com/sonyericsson/hudson/plugins/gerrit/trigger/GerritManagement/index.jelly
	gerrithudsontrigger/src/test/java/com/sonyericsson/hudson/plugins/gerrit/trigger/mock/MockGerritHudsonTriggerConfig.java

I need to stop taking in changes that hasn't run checkstyle or has no tests.