Update hardwareDescription strings

Information was provided by several sources including:
• http://theiphonewiki.com/wiki/IPhone
• http://theiphonewiki.com/wiki/IPad
• http://theiphonewiki.com/wiki/IPad_mini
• http://everymac.com/ultimate-mac-lookup/?search_keywords=iPhone6%2C1
• http://everymac.com/ultimate-mac-lookup/?search_keywords=iPhone6%2C2

The enums should also be refactored some time in the future.