updating draggable.js Added features :  1. drag and drop vnfs,  2. connect vnfs,  3. connection and vnf styles,  4. show connection list (for debugging purpose)  5. delete dropped vnfs,  6. delete connections,  7. connect to same instance of vnf
updating draggable.js
Added features :
 1. drag and drop vnfs,
 2. connect vnfs,
 3. connection and vnf styles,
 4. show connection list (for debugging purpose)
 5. delete dropped vnfs,
 6. delete connections,
 7. connect to same instance of vnf

CN-UPB/upb-son-editor-frontend,CN-UPB/upb-son-editor-frontend