confirm/edit review step after each transaction

[zacchiro]

[ context: this thread on the Ledger-cli maling list https://groups.google.com/forum/#!topic/ledger-cli/AfGKE2Svv0s ]

It would be nice if icsv2ledger could provide an extra (maybe optional) step to review/edit each transactions after it has generated it.
That would shield from mistyping transaction information and, more generally, improve the user sense of being in control of what's happening while going through many transactions at a time.

With many thanks for maintaining icsv2ledger!

[mondjef]

created pull request #100 that addresses this. Please have a look and let me know if you see any issues.