Fixed bug where JVM was never shutting down because of an always false check.
Removed \_enter and __exit_ methods from OWLAPIAdaptor because that structure does not allow for creation of new instance of OWLAPIAdaptor. That is because if the JVM is stopped then you cannot restart it ( this is a limitation of JPype)
Currently when initializing an object of OWLAPIAdaptor the JVM is started automatically (this is required to perform the successful initialization of the object, therefore the option to manually start the JVM is not possible)
New method: To stop the JVM the user can use the method OWLAPIAdaptor.stopJVM(). This method can be called when the user is finished with using its adaptor objects.
OWLAPIAdaptor.stopJVM(). This method can be called when the user is finished with using its adaptor objects.