System.timeMillis method renamed to measureTimeMillis and measureTimeNano added

stdlib/ktSrc/System.kt

@@ -3,8 +3,17 @@ namespace std.util
 /**
 Executes current block and returns elapsed time in milliseconds
 */
-fun millisTime(block: fun() : Unit) : Long {
+fun measureTimeMillis(block: fun() : Unit) : Long {
     val start = System.currentTimeMillis()
     block()
     return System.currentTimeMillis() - start
+}
+
+/**
+Executes current block and returns elapsed time in milliseconds
+*/
+fun measureTimeNano(block: fun() : Unit) : Long {
+    val start = System.nanoTime()
+    block()
+    return System.nanoTime() - start
 }