CLOUDSRV-2959 & NODEJS-1103 fix the session bug which had been saved by the sdk and add a generic method.
Rewrite the examples of the sdk, to make the usage more clearly.
Fix the examples' readme file.
Merge pull request #11 from peri18/NODEJS-1103-GENERIC-METHOD-ACS

Nodejs 1103 providing a generic method for ACS rest api calls NODEJS-1133 Removing global variable to store session_id