Type 'Description.class' added -
Relation bettween 'Issue.class' and 'Description.class'.

new component in tracker : TextAreaComponent.java
-> org.genericsystem.tracker.component.generic.TextAreaComponent

AbstractTextAreaComponent doesn't exists yet in
org.genericsystem.framework.

preview next commit : 
Abstract class AbstractTextAreaComponent in
'org.genericsystem.framework'