Code refactoring, no behavior change.

Changed a couple of member variables to be more descriptive.  Unified setting of signature metadata into one function.

Change-Id: I4b4730d8159b8a67a4d9d39713dc2bec8eb8d01a
diff --git a/slang_version.h b/slang_version.h
index 287dc3e..e42f1a5 100644
--- a/slang_version.h
+++ b/slang_version.h
@@ -22,6 +22,7 @@
 // HC -> Honeycomb
 // ICS -> Ice Cream Sandwich
 // JB -> Jelly Bean
+// KK -> KitKat
 enum SlangTargetAPI {
   SLANG_MINIMUM_TARGET_API = 11,
   SLANG_HC_TARGET_API = 11,