Update the interface of salsa-engine, refine the salsa-pioneer
Cloud connector can use external configurations
add RESTful for showing application tree in Json. Consisce the CenterConfiguration.
Change the common stuff which affect to other components.
add tree interface and notification.
add tree and small stuff in deployment of one VM
edit some test files
add the cloud provider information structure.
refine the component status updating.
Add description.
add another initial version of enricher