Add CASE_INSENSITIVE flag to Pattern (#65)

Adds a flag to ignore case on Rsa JceMasterKey. This will avoid warning users
about unsupported lowercase algorithm names.

Author: johnwalker

src/main/java/com/amazonaws/encryptionsdk/jce/JceMasterKey.java

@@ -238,7 +238,8 @@ public WrappingData(final Cipher cipher, final byte[] extraInfo) {
 
     private static class Rsa extends JceMasterKey {
         private static final Pattern SUPPORTED_TRANSFORMATIONS =
-            Pattern.compile("RSA/ECB/(?:PKCS1Padding|OAEPWithSHA-(?:1|256|384|512)AndMGF1Padding)");
+            Pattern.compile("RSA/ECB/(?:PKCS1Padding|OAEPWithSHA-(?:1|256|384|512)AndMGF1Padding)",
+                    Pattern.CASE_INSENSITIVE);
         private final String transformation_;
 
         private Rsa(PublicKey wrappingKey, PrivateKey unwrappingKey, String providerName, String keyId,