Updated to use Dropbox API v2.0. I was notified that the Dropbox API v1.0 we were using would be turned off. To use the new Dropbox API v2.0 Objective-C SDK, I also had to update the minimum iOS version from 5.0 to 8.0.

The CSV export feature received two bug fixes and an upgrade:
1. Fixed a bug that could crash the app when exporting a database with rows containing UTF-8 characters. Before, the CSV was exported in ASCII. Now it exports in UTF-8.
2. Fixed an bug that could cause the app to crash when exporting a large database.
3. Upgraded the CSV export feature to allow it to export to any compatible app, in addition to the default mail app.