incorrect JavaDoc for TObjectIntHashMap.get()

[Martin]

The JavaDoc for TObjectIntHashMap.get() says that the method returns null if there's no entry in the map for the given key. However, the method returns 0 instead of null in this case.

see http://trove4j.sourceforge.net/javadocs/gnu/trove/map/hash/TObjectIntHashMap.html#get%28java.lang.Object%29

[Rob Eden]

Duplicate of #43.