More fixes from Unit tests.

-Fixed: ArrayList/LinkedList extractElements crashing when 0 or less elements are desired.
-Fixed: TreeMap pollFirst/LastKey should return the defaultMin/max value instead of a Empty value.
-Fixed: TreeMap keySet implementation was missing the class type implementations to pass keySet tests.
-Fixed: TreeMap.SubMap Iterator (primitive Keys) was crashing because a Null was set on to a primitive.

build.gradle

@@ -18,7 +18,7 @@ repositories {
 }
 
 archivesBaseName = 'Primitive Collections'
-version = '0.6.1.10';
+version = '0.6.1.17-SNAPSHOT';
 
 sourceCompatibility = targetCompatibility = compileJava.sourceCompatibility = compileJava.targetCompatibility = JavaVersion.current();