Add npm badge (SonarSource#891)

Bump up to version 4.0 (SonarSource#877)

Update parent pom to v41

Update ruling for 'Assignments should not be redundant'

Update link to travis build to use new repo name (SonarSource#793)

Update rules metadata (SonarSource#789)

* Update rules metadata

* small fix

pom version update to patch 3.1.1

Fix FP in S3516 (SonarSource#608)

Improve test coverage in MetricsTest (SonarSource#605)

Update parent pom to version 40 (SonarSource#579)