BitShares/bitshares_toolkit — pull request #146 by HackFisher (2014-05-28 10:31:45+00:00)
Title: Resolve wallet cache when chain switch fork, if following with existing design,  related to #133

Resolve partial issue described in #133.

For wallet export/import, still need to re-scan the chain to update the wallet cache,
```wallet_export_to_json``` and ```wallet_create_from_json```