Fixed BooleanClause.ToString().  Extension method has lower priority over instance method on Occur.
Fixed BooleanClause.ToString().  Extension method has lower priority over instance method on Occur.

git-svn-id: 579465d8e1dacce7a4aeecbe2d6cca1bad799e0c@1384848 13f79535-47bb-0310-9956-ffa450edef68

laimis/lucenenet,jeme/lucenenet,NightOwl888/lucenenet,zmaruo/lucenenet,apache/lucenenet,jeme/lucenenet,apache/lucenenet,sisve/lucenenet,antiufo/lucenenet,laimis/lucenenet,jpsullivan/lucenenet,jeme/lucenenet,apache/lucenenet,mdissel/lucene.net,antiufo/lucenenet,NightOwl888/lucenenet,mdissel/lucene.net,zmaruo/lucenenet,jeme/lucenenet,NightOwl888/lucenenet,jpsullivan/lucenenet,NightOwl888/lucenenet,sisve/lucenenet,apache/lucenenet