Change measures badge neutral color to SonarCloud blue.

[JeneJasper]

Change measures badge neutral color to SonarCloud blue.

Related: #75

.navbar-tabs>li>a.active, .navbar-tabs>li>a:focus, .navbar-tabs>li>a:hover { border-bottom-color: #4b9fd5; }

.badge { background-color: #4b9fd5; }

[JeneJasper]

Build failures reason is config issue?

[ERROR] Failed to execute goal org.sonarsource.scanner.maven:sonar-maven-plugin:3.3.0.603:sonar (default-cli) on project qualinsight-plugins-sonarqube-badges: 
Failed to execute project builder: org.sonar.plugins.github.PullRequestProjectBuilder: 
Unable to perform GitHub WS operation: {"message":"Bad credentials","documentation_url":"https://developer.github.com/v3"}