Use recursive open struct to set item methods
Added dublin_core and item_type_metadata as instance variables
Add pry as development dependency
Dublin Core reader and setter methods work
Add methods for Item Type Metadata
Rewrote the texts for new structure of OmekaItem
Updated README with post, put, delete methods and new OmekaItem methods
Methods to read and set the Dublin Core and Item Type Metadata
Added methods to put, post, and delete OmekaItem instances
Bump version number