inconsistent resource properties setting/accessing

[ridoo]

When adding a new property to a resource the key is set as is. When accessing the value the key is transformed to lower characters. This results in not finding a parameter by

resource.addProperty("myProperty", "value");
resource.hasProperty("myProperty"); // returns false
resource.hasProperty("myproperty"); // returns true

Transforming the key to lower characters would fix this issue.