It is now possible to execute a query with an empty "onRows" key
Moreover, explore method needs a JSONObject, not a JSONArray.
resolved a bug with constructed json

Conflicts:
	src/fr/solap4py/core/JSONBuilder.java
Merge branch 'develop' of https://github.com/Westpic/solap4py-java.git
into develop

Conflicts:
	src/fr/solap4py/core/JSONBuilder.java