Changed the implementation of the Configuration module.
- Configuration value object is a hashtable.
- Values are validated.
ASPEM can be launched as an embedded server.
- The Grid Operator launches ASPEMs by using embedded Jetty servers.
- The description of the ASPEM is not stored into the database. It is retrieved from the context-params.
Removed the name of the ASPEM from the configuration object.
Merge branch 'config' into next

Conflicts:
	pom.xml
	src/main/java/es/siani/aspem/ApplicationBootstrap.java