Convert 'SharperNLP.MaxEntropy.Test.Model.IndexHashTableTest.cs' from Java to C#

[pburrows]

The file \Model\IndexHashTableTest.cs needs to be converted from Java to C#. The original source Java file is here:
\opennlp\opennlp-maxent\src\test\java\opennlp\model\indexhashtabletest.java

You can view the Java file online underneath this path:
http://svn.apache.org/viewvc/incubator/opennlp/trunk/opennlp-maxent/src/test/java/opennlp/