Fix: Memory leak

The name of method selection strategy wasn't interned. Causing the
multiplication of strings containing "BRAINY".

core/src/main/kotlin/se/lth/cs/JMHProcessor.kt

@@ -99,7 +99,7 @@ class JMHProcessor {
             records.map{
                 val methodSelection =
                         if (it.isSet("Param: methodSelectionStrategyId")) {
-                            it.get("Param: methodSelectionStrategyId")
+                            it.get("Param: methodSelectionStrategyId").intern()
                         } else {
                             null
                         }