#107 severity as constraint attribute
#107 cleanup
#107 parameter validation
#107 severity support in sonar extension
Merge branch 'master' into severity-patch

Conflicts:

core/analysis/src/main/java/com/buschmais/jqassistant/core/analysis/impl
/RuleSetWriterImpl.java
#107 severity as constraint attribute
#107 cleanup
#107 parameter validation
#107 severity support in sonar extension
#107 severity - sonar export
Merge branch 'severity-patch'
Merge pull request #109 from aparnachaudhary/severity-patch

Severity patch