In ledger-reconcile, use a function to get where the transaction is.
In ledger-reconcile, open file where transaction are, and store it.
In ledger-reconcile-get-buffer, return the stored buffer
After reconciling, save all buffer that need to be saved.
Merge pull request #147 from vanicat/t/where-are-transaction

Current version of ledger-mode fail to reconcile when there are included file