Added support for BlockDeviceMapping and servers booting from block device
added more options for block device mapping - sourceType, destinationType and deleteOnTermination
Merge branch 'for_pull_requests' of git://github.com/jsovicka/openstack4j into jsovicka-for_pull_requests

Conflicts:
	src/main/java/org/openstack4j/openstack/compute/domain/NovaServerCreate.java
Merge branch 'jsovicka-for_pull_requests'