Another typo fix
Removes cope_index_sum as cope_index is self_support specific and should not be in qwester
Adds facility to preserve an answer store
Adds method to destroy all unpreserved answer stores
Adds rake task to remove unpreserved answer stores
Modifies AnswerStore.destroy_unpreserved so that it doesn't remove new answer stores
Adds preservation notes to readme
Adds facility to restore a preserved answer store
Removes requirement for answer store to be preserved before it can be restored
Bump version to 0.0.8