Add BooleanReader to allow boolean primitive to be read

Resolves #280

json-path/src/main/java/com/jayway/jsonpath/spi/mapper/JsonSmartMappingProvider.java

@@ -44,6 +44,7 @@ public class JsonSmartMappingProvider implements MappingProvider {
         DEFAULT.registerReader(String.class, new StringReader());
         DEFAULT.registerReader(Date.class, new DateReader());
         DEFAULT.registerReader(BigInteger.class, new BigIntegerReader());
+        DEFAULT.registerReader(boolean.class, new BooleanReader());
     }
 
 
@@ -245,4 +246,18 @@ public class JsonSmartMappingProvider implements MappingProvider {
             throw new MappingException("can not map a " + src.getClass() + " to " + Date.class.getName());
         }
     }
+    private static class BooleanReader extends JsonReaderI<Boolean> {
+        public BooleanReader() {
+            super(null);
+        }
+        public Boolean convert(Object src) {
+            if(src == null){
+                return null;
+            }
+            if (Boolean.class.isAssignableFrom(src.getClass())) {
+                return (Boolean) src;
+            }
+            throw new MappingException("can not map a " + src.getClass() + " to " + Boolean.class.getName());
+        }
+    }
 }

json-path/src/test/java/com/jayway/jsonpath/MapperTest.java

@@ -52,4 +52,10 @@ public class MapperTest extends BaseTest {
     public void a_String_can_be_converted_to_a_BigDecimal() {
         assertThat(parse("{\"val\": \"1.5\"}").read("val", BigDecimal.class)).isEqualTo(BigDecimal.valueOf(1.5d));
     }
+
+    @Test
+    public void a_Boolean_can_be_converted_to_a_primitive_boolean() {
+        assertThat(parse("{\"val\": true}").read("val", boolean.class)).isTrue();
+        assertThat(parse("{\"val\": false}").read("val", boolean.class)).isFalse();
+    }
 }