refactored messages provider, make it more generic
gonna move welcome message and prompt in here too
moved welcome, bye & prompt messages in messages.yml
added messages structure in messages.yaml
removed delete alias since for some (rhino) reason which I'm not going to investigate now it's not possible to get to its help
renamed parseJson to toJson
renamed facets method, should have been facetBuilder instead of facets

Conflicts:
	src/main/java/org/elasticsearch/shell/client/builders/core/SearchRequestBuilder.java
added carriage return