Switched to .NET 4.5; Added SOFTWARE_VERSION as an identifier type for PREMIS Agents; Added support for making some links into one-way, all links previously defaulted to two-way; Parameterized the PREMIS version and XML Schema; Added the ability to specify which PREMIS entities are persisted during the serialization to XML; Some misc. code cleanup, refactoring, and code comments; Moved the CharacterizeFile method to the MedusaHelpers class; Added support for PREMIS 2.2 and TermOfRestriction