Implement ISerialize, add get items method

Implement ISerialize, add get items method and set up the constructor
to take a DataGridView parameter and set it to the instance variable of
table.  the setIetmes() method is then called
Added Object Serialisation

Can now serialise a Practice Schedule object to a .ps file and load it
back into the datagrid viewer.  Need to refine the saving and loading.
Merge branch 'master' of github.com:matfarley/GuitarPracticeLog

Conflicts:
	GuitarPracticeLog.v11.suo
	PracticeLog/Model.cs
	PracticeLog/Schedule.cs
	PracticeLog/obj/Debug/PracticeLog.csproj.FileListAbsolute.txt