title: authentication through web service SonarQube
body: <p>I'm working on a web application that highly requires SonarQube (version 5.3) Web Services.
  I want to authenticate to the sonarqube instance using my application.
  which web service should I use? 
  Another question :
  While using the issues web service I noticed that the web service returns the issues of the last project analysed by sonar.
  Is there a way to have the issues of all the projects or to have the issues of a given project?</p>