Backporting #55 to ognl-3-1-x branch.

[harawata]

getDeclaredMethods() should search super-interfaces recursively.

[harawata]

I noticed that 3.1.x still uses Introspector#getBeanInfo() in getReadMethod() (i.e. #33 was not backported).
So, the following tests will fail.

// In Java8Test
Method method = OgnlRuntime.getReadMethod(ClassWithDefaults.class, "defaultMethod");
assertNotNull(method);
Method method = OgnlRuntime.getReadMethod(SubClassWithDefaults.class, "defaultMethod");
assertNotNull(method);

I am going to fix this in the next PR.

[lukaszlenart]

I assume it's ready, right?

[harawata]

I believe it is, yes. :)

[lukaszlenart]

LGTM 👍