LUCENENET-515 "bring back TokenStream.GetAttribute(Type)" Some cleanup of AttributeSource.cs
LUCENENET-515 "bring back TokenStream.GetAttribute(Type)"
Some cleanup of AttributeSource.cs

git-svn-id: 579465d8e1dacce7a4aeecbe2d6cca1bad799e0c@1420558 13f79535-47bb-0310-9956-ffa450edef68

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