These changes were orginally commited by Eric Chatellier
All I added was a try catch clause in KeepLastIndexDeletionPolicy.java
I also needed to add  -XX:MaxPermSize=128m to the Java Command line to
get it to run.

java -XX:MaxPermSize=128m -jar  luke-4.3.0-jar-with-dependencies.jar
Merge pull request #6 from PeterLenahan/master

Lucene 4.3 changes from Eric Chatellier, plus a syntax correction