Revert "Remove Values"

This reverts commit 249cfcf5e17b37cbaae08fc4cc2375f40ca99d8e.

Conflicts:
	internal/readme.md
Restore values.
set_value / get_value on Kingdom
Add tests for kingdom variables
Add field for StoredValueField
Implement StoredValueField()
Migration for Value
Value store on kingdom
Remove expiration from admin
Reorganize model fields
Fix south