WIP
Merge remote-tracking branch 'origin/JSQLW-30-Support-different-databases'

Conflicts:
	pom.xml
	src/main/java/com/javaloping/jsql/beans/PropKeys.java
	src/main/java/com/javaloping/jsql/service/QueryExecutorServiceImpl.java
	src/main/resources/initial_data.sql
	src/main/webapp/js/sql-edit.js
JSQLW-30 Support different dbs. Initial approachment