Merge pull request #54 from garydgregory/PropertyStore_clearCache

Add org.apache.juneau.PropertyStoreBuilder.clearCache().
diff --git a/juneau-core/juneau-marshall/src/main/java/org/apache/juneau/PropertyStoreBuilder.java b/juneau-core/juneau-marshall/src/main/java/org/apache/juneau/PropertyStoreBuilder.java
index c9c0b24..88b42a7 100644
--- a/juneau-core/juneau-marshall/src/main/java/org/apache/juneau/PropertyStoreBuilder.java
+++ b/juneau-core/juneau-marshall/src/main/java/org/apache/juneau/PropertyStoreBuilder.java
@@ -75,6 +75,13 @@
 	}
 
 	/**
+	 * Clears the PropertyStore cache.
+	 */
+	public void clearCache() {
+		CACHE.clear();
+	}
+	
+	/**
 	 * Copies all the values in the specified property store into this builder.
 	 *
 	 * @param copyFrom The property store to copy the values from.